5 Natural Supplements to Boost Bowel Movements in 2025

If you're searching for evidence-based natural supplements to relieve chronic constipation, you're not alone, and you deserve answers grounded in clinical research, not guesswork. Five evidence-supported options to increase bowel movements are: dried plums (prunes), two green kiwifruits daily, psyllium fiber, magnesium oxide (1.5 g/day in RCTs), and probiotics (Bifidobacterium lactis). These therapies are backed by randomized controlled trials, meta-analyses, and the 2023 AGA/ACG clinical practice guideline for chronic idiopathic constipation. Guideline-backed sequencing starts with fiber and food-based therapies, then escalates to osmotic agents like magnesium oxide (with appropriate renal monitoring) or polyethylene glycol (PEG), while emphasizing safety caveats for patients with kidney disease and cautioning against long-term stimulant laxative use.

At Let Loose, we understand the frustration of constipation and the overwhelming array of supplement claims. That's why we've anchored this guide to clinical evidence: real trials, systematic reviews, and expert consensus from the American Gastroenterological Association and American College of Gastroenterology. Our mission is to help you make informed choices with confidence, whether you're looking for a gentle daily solution or need to understand when to escalate care.

Quick Answer: Top 5 Natural Options (TL;DR)

For immediate clarity, here are the five natural supplements and food-based therapies with strong clinical evidence to improve bowel movements, complete with one-line rationales and key citations:

• Prunes (dried plums): Food-based RCT evidence shows prunes increased complete spontaneous bowel movements (CSBMs) and improved stool consistency more than psyllium in head-to-head trials.

• Kiwifruit (two green kiwis daily): Meta-analysis of five RCTs demonstrated significantly increased defecation frequency (p = 0.0008) and improved abdominal comfort versus control groups.

• Psyllium (soluble fiber): Multiple RCTs support increased stool frequency; the 2023 AGA/ACG guideline gives fiber a conditional recommendation as first-line therapy when combined with adequate hydration.

• Magnesium oxide (MgO): A double-blind RCT using 1.5 g/day showed 70.6% of participants met the primary endpoint versus 25.0% with placebo after 28 days; requires renal function monitoring due to hypermagnesemia risk in elderly or chronic kidney disease patients.

• Probiotics (Bifidobacterium lactis strains): Strain-specific meta-analyses report modest but statistically significant increases in stool frequency and improved consistency, though efficacy varies by strain and dose.

Clinical context: The 2023 guideline recommends starting with fiber or food-based therapies for 2-4 weeks, then adding osmotic agents (PEG receives a strong recommendation; MgO is conditional) if symptoms persist. These five options represent the best-evidenced natural approaches that align with guideline principles and can be integrated into a systematic trial-and-monitor plan.

How the Evidence Rates Each Option

Understanding the quality and strength of evidence behind each supplement is essential for making informed decisions. Here's what randomized trials, meta-analyses, and clinical guidelines tell us about each therapy.

Prunes (Dried Plums): RCT Findings and Practical Dosing

Prunes stand out as one of the most well-studied food-based therapies for constipation. A landmark randomized clinical trial directly compared dried plums to psyllium, a widely recommended fiber supplement, and found that prunes delivered superior results. Participants consuming prunes experienced greater weekly complete spontaneous bowel movements and improved stool consistency compared to those taking psyllium. The trial used practical serving sizes that align with typical dietary consumption, making prunes an accessible and palatable option for most people.

Beyond the primary outcomes, prunes offer additional benefits: they contain sorbitol (a natural osmotic agent), fiber, and phenolic compounds that may stimulate colonic motility. The typical trial dose ranged from 50-100 grams daily (approximately 5-12 prunes), divided into one or two servings. For patients with diabetes or those monitoring sugar intake, it's worth noting that prunes do contain natural sugars and contribute about 240 calories per 100-gram serving, factors to discuss with your healthcare provider when incorporating them into your diet.

Key takeaway: Prunes offer RCT-level evidence for improving both frequency and quality of bowel movements, with the added advantage of being a whole food rather than a processed supplement. They work through multiple mechanisms and are generally well-tolerated, though portion control matters for calorie and sugar management.

Kiwifruit: Meta-Analysis Outcomes and Dose

Green kiwifruit has emerged as a scientifically validated natural remedy for constipation, with evidence from a systematic review and meta-analysis pooling data from five randomized controlled trials. The findings are compelling: daily consumption of two green kiwifruits significantly increased defecation frequency (p = 0.0008) and improved abdominal comfort compared to control groups or psyllium supplementation. Trial durations typically ranged from 4 to 6 weeks, with populations including both chronic idiopathic constipation and functional constipation.

What makes kiwifruit particularly interesting is its multifaceted mechanism of action. The fruit contains actinidin (a proteolytic enzyme that may enhance protein digestion and colonic motility), soluble and insoluble fiber, and natural water content that supports stool softening. Participants in trials reported improvements not just in frequency but also in ease of defecation and reduced straining, quality-of-life factors that matter as much as the numbers.

The evidence specifically supports two green kiwifruits per day as the effective dose. Gold kiwifruit varieties were studied less extensively, so stick with green varieties (Hayward cultivar) if you're following the research protocol. Most participants tolerated kiwifruit well, with fewer adverse events compared to fiber supplements like psyllium, which can cause bloating in some individuals. The meta-analysis concluded that kiwifruit offers a promising, evidence-based dietary intervention for adults with mild to moderate constipation.

Psyllium (Soluble Fiber): RCTs and Guideline Context

Psyllium husk is perhaps the most widely studied and recommended fiber supplement for constipation, backed by multiple randomized controlled trials spanning decades. As a bulk-forming laxative, psyllium absorbs water in the intestine, increasing stool bulk and stimulating peristalsis. The 2023 AGA/ACG guideline gives fiber, specifically psyllium, a conditional recommendation, meaning the panel determined that most patients would benefit but acknowledged variability in response and the need for adequate fluid intake.

The "conditional" designation doesn't diminish psyllium's value; rather, it reflects the guideline's evidence-grading system and the recognition that fiber works best when combined with lifestyle factors. Clinical trials consistently show that psyllium increases stool frequency and improves consistency, but results depend heavily on hydration. Patients who don't drink enough water with psyllium may experience bloating, gas, or even worsening constipation, a common pitfall that leads to premature discontinuation.

Typical dosing starts at 5-10 grams of psyllium powder once or twice daily, mixed with at least 8 ounces of water per dose. We recommend starting at the lower end and titrating up over 7-10 days to minimize gastrointestinal side effects. Psyllium is ideal as a first-line therapy because it's safe for long-term use, affordable, and available over-the-counter in multiple formulations (powder, capsules, wafers). The key is patience; fiber therapies typically require 2-4 weeks to show full benefit and commitment to hydration (aim for 8-10 glasses of water daily).

Magnesium Oxide: RCT Efficacy and Safety Caveats

Magnesium oxide represents a step up in intervention intensity, functioning as an osmotic laxative that draws water into the colon to soften stool and stimulate bowel movements. A rigorous double-blind randomized controlled trial evaluated 1.5 grams per day of magnesium oxide versus placebo and found impressive results: 70.6% of participants in the MgO group met the primary efficacy endpoint compared to just 25.0% in the placebo group after 28 days. These are clinically meaningful numbers that justify magnesium oxide's place in the therapeutic armamentarium.

However, magnesium oxide requires more careful consideration than food-based or fiber therapies due to safety concerns in specific populations. The primary risk is hypermagnesemia (elevated blood magnesium levels), which can occur in patients with impaired renal function. The kidneys normally excrete excess magnesium, but in chronic kidney disease (CKD) or in elderly patients with declining renal function, magnesium can accumulate to dangerous levels, potentially causing cardiac arrhythmias, muscle weakness, and altered mental status.

Because of these risks, the 2023 guideline gives magnesium oxide a conditional recommendation. Before starting MgO, especially at the 1.5 g/day dose used in trials, we strongly advise checking baseline renal function (serum creatinine and estimated GFR). Elderly patients, those with known kidney disease, and anyone on medications that affect renal function should use MgO only under medical supervision with periodic monitoring of serum magnesium levels. Common but less serious side effects include diarrhea (which may actually be therapeutic in constipation) and abdominal cramping, both of which are dose-dependent.

Clinical pearl: Magnesium oxide is most appropriate as a second-line option after fiber/food-based therapies have proven insufficient, or as an alternative to polyethylene glycol (PEG) for patients who prefer a simpler dosing regimen. The RCT evidence is solid, but individualized risk assessment is essential.

Probiotics (B. lactis and Others): Strain-Specific Evidence

The probiotic landscape for constipation is complex, with efficacy highly dependent on the specific bacterial strain, dose, and formulation. Meta-analyses pooling data from multiple trials show that certain probiotic strains, most notably Bifidobacterium lactis, demonstrate modest but statistically significant improvements in stool frequency and consistency. Effect sizes are generally smaller than those seen with osmotic laxatives or even food-based therapies, but probiotics offer a complementary mechanism: modulation of gut microbiota composition and potentially enhanced colonic motility through neuroimmune pathways.

The challenge with probiotics is heterogeneity. Not all strains work equally, and trial doses range widely (from 1 billion to over 10 billion colony-forming units per day). The most consistent evidence exists for Bifidobacterium lactis strains (including BB-12 and HN019 designations), with some support for Lactobacillus casei Shirota and certain multi-strain formulations. Unfortunately, many over-the-counter probiotic products don't specify strain designations or use proprietary blends that haven't been studied in constipation trials, making it difficult for consumers to match products to evidence.

For patients interested in trying probiotics, we recommend looking for products that explicitly list B. lactis with a strain identifier and provide at least 1-5 billion CFU per serving. Trial duration should be at least 4 weeks, as probiotic effects on bowel function typically emerge gradually. Monitor stool frequency and consistency using objective metrics (complete spontaneous bowel movements per week, Bristol Stool Scale score). Probiotics are generally very safe, though immunocompromised patients should consult their physician before use due to rare reports of probiotic sepsis in severely immunosuppressed individuals.

Clinical How-To: Trial, Sequence, and Monitor (Stepwise Algorithm)

Turning evidence into action requires a systematic approach. Here's how to trial natural supplements safely and effectively, with clear escalation pathways and monitoring checkpoints.

5-Step Clinician Algorithm (Screen → Start → Escalate → Review → Refer)

Step 1: Screen for alarm features and exclude secondary causes. Before starting any self-treatment for constipation, rule out red flags that warrant immediate medical evaluation: gastrointestinal bleeding (visible blood in stool or black tarry stools), unexplained weight loss (>5% body weight without trying), severe or progressive abdominal pain, new-onset constipation in adults over 50, or a family history of colorectal cancer. These alarm features may indicate serious underlying pathology (obstruction, malignancy, inflammatory bowel disease) that requires diagnostic workup before symptomatic treatment.

Step 2: Start with fiber or food-based therapy for 2-4 weeks. First-line management should begin with the safest, most physiologic options. Choose one approach: (a) psyllium fiber 5-10 grams daily with adequate water (8-10 glasses/day); (b) two green kiwifruits daily; or (c) 50-100 grams of prunes daily. Combine with lifestyle modifications: regular meal timing, increased physical activity (even a 20-minute daily walk helps), and establishing a consistent toilet routine (especially after breakfast when the gastrocolic reflex is strongest). Set a 2-week checkpoint: if you see partial improvement, continue for 4 weeks total; if zero improvement, proceed to Step 3.

Step 3: Add an osmotic agent if fiber/food therapy is insufficient. The guideline gives polyethylene glycol (PEG, e.g., MiraLAX) a strong recommendation as the preferred osmotic laxative due to robust efficacy and excellent safety profile. Typical PEG dosing is 17 grams (one capful) daily in 4-8 ounces of liquid. If PEG is not tolerated or preferred, magnesium oxide 1.5 grams daily is a conditional alternative, but only after verifying normal renal function (check serum creatinine and eGFR) and with ongoing monitoring in elderly or CKD patients. Give osmotic therapy for 2-4 weeks at a stable dose before declaring failure.

Step 4: Consider adjunctive probiotics and avoid problematic agents. While awaiting full response to osmotic therapy, adding a Bifidobacterium lactis probiotic (1-5 billion CFU daily) may provide incremental benefit. However, avoid aloe vera-based stimulant laxatives due to regulatory concerns, the FDA removed OTC approval for aloe-containing laxatives, and IARC classified whole-leaf aloe extract as possibly carcinogenic. If a stimulant is needed (constipation refractory to osmotic therapy), use senna short-term only (1-2 weeks) per the guideline's conditional recommendation, as chronic stimulant use can lead to dependency and colon damage.

Step 5: Monitor response and escalate to prescription therapies if needed. Track outcomes objectively: count complete spontaneous bowel movements per week (CSBMs, defecation without rescue laxative and with a sense of complete evacuation) and assess stool consistency using the Bristol Stool Scale (target type 3-4, formed but soft). If after 4-6 weeks of optimized fiber + osmotic therapy you still have <3 CSBMs per week or persistent hard stools (Bristol 1-2), it's time for medical referral. Prescription options include secretagogues (linaclotide, plecanatide, strong recommendations) or prokinetics (prucalopride), which address underlying motility dysfunction rather than just adding bulk or water.

Patient Quick-Start 7-28 Day Plan (Snippable)

For individuals ready to begin a natural supplement trial at home, here's a practical timeline:

Days 1-7 (Foundation week): Increase daily fluid intake to 8-10 glasses of water. Start one first-line therapy: psyllium fiber (5 grams once daily with 8 oz water), two green kiwifruits each morning, or a serving of prunes (about 50 grams/5 prunes) with breakfast. Do not combine multiple therapies initially; you want to know what works. Track daily bowel movements and stool consistency. Common initial side effects (bloating with fiber, mild cramping) usually resolve within 3-5 days.

Days 8-28 (Escalation and assessment): If Days 1-7 showed partial improvement (increased frequency but still <3 CSBMs/week), continue the same therapy and optimize hydration and timing. If zero improvement by Day 7-10, add or switch to an osmotic agent: start polyethylene glycol 17 grams daily (mix into coffee, juice, or water) OR, after checking with your healthcare provider about renal function, magnesium oxide 1.5 grams daily. Continue tracking. By Day 28, you should see meaningful improvement (≥3 CSBMs/week, Bristol type 3-4 stools). If not, schedule a medical appointment.

When to contact your clinician immediately: Worsening abdominal pain, new rectal bleeding, vomiting, inability to pass gas (signs of obstruction), or severe diarrhea (>6 watery stools/day, which suggests overdosing on osmotic laxatives). These warrant urgent evaluation.

Safety, Contraindications, and 'When to See a Doctor'

Natural does not always mean risk-free. Understanding safety considerations prevents harm and ensures you're a good candidate for self-management.

Alarm Features and Urgent Referral Checklist

Do not attempt self-treatment with supplements if you have any of the following, seek medical evaluation first:

• Gastrointestinal bleeding: Bright red blood in stool, black tarry stools, or positive fecal occult blood test

• Unexplained weight loss: Losing >5-10 pounds without dietary changes or intentional effort

• Severe or progressive abdominal pain: Pain that wakes you at night, is getting worse over days/weeks, or is localized and sharp.

• New-onset constipation in adults ≥50 years: Sudden change in bowel habits may signal colorectal cancer and warrants colonoscopy

• Family history of colorectal cancer or inflammatory bowel disease: Especially if constipation is new or associated with other GI symptoms

The 2023 guideline emphasizes that screening for alarm features is mandatory before initiating empiric treatment. These red flags may indicate mechanical obstruction, malignancy, ischemic colitis, or severe motility disorders requiring diagnostic imaging and endoscopy.

Magnesium Oxide Safety: Renal Function and Hypermagnesemia

While magnesium oxide showed impressive efficacy in the 1.5 g/day RCT (70.6% response vs 25.0% placebo), it carries specific risks that demand caution. Hypermagnesemia, elevated serum magnesium, can cause cardiac conduction abnormalities, muscle weakness, hypotension, respiratory depression, and altered mental status. The elderly and patients with chronic kidney disease are at the highest risk because impaired renal magnesium excretion allows accumulation.

Before starting magnesium oxide, especially at doses ≥1.5 grams daily, obtain baseline labs: serum creatinine and estimated glomerular filtration rate (eGFR). If eGFR is <60 mL/min/1.73m² (Stage 3 CKD or worse), magnesium oxide is relatively contraindicated; choose PEG instead. For patients with borderline renal function or age >70, consider checking a serum magnesium level after 2-4 weeks of therapy to ensure it remains in the normal range (1.7-2.2 mg/dL).

Common, less serious side effects of magnesium oxide include dose-dependent diarrhea (which may be therapeutic in constipation but can become excessive) and transient abdominal cramping. If diarrhea becomes problematic (>3 loose stools/day), reduce the dose by half and titrate more gradually. Always take magnesium oxide with food to minimize GI upset.

Avoid or Caution: Aloe and Long-Term Stimulant Laxative Use

Not all "natural" constipation remedies are safe or advisable. Aloe vera-based stimulant laxatives should be avoided entirely. The FDA removed over-the-counter approval for aloe-containing laxative products due to insufficient safety data, and the International Agency for Research on Cancer (IARC) classified whole-leaf aloe extract as possibly carcinogenic to humans based on animal studies showing intestinal tumors. While aloe is commonly marketed in herbal constipation formulas, the risk-benefit profile does not support its use when safer, evidence-based alternatives exist.

Stimulant laxatives in general, including senna, bisacodyl, and cascara, should be reserved for short-term use only (1-2 weeks maximum). The 2023 guideline gives senna a conditional recommendation, acknowledging it can relieve acute constipation but cautioning against chronic use due to the potential for dependency and melanosis coli (benign but concerning colon pigmentation). Long-term stimulant use was historically believed to damage the enteric nervous system ("cathartic colon"), though recent evidence suggests this risk may be overstated. Nonetheless, the guideline's position is clear: try fiber, osmotic agents, and prescription secretagogues/prokinetics before relying on daily stimulant laxatives.

Additional cautions: Probiotics are generally safe but should be used cautiously in severely immunocompromised patients (active chemotherapy, advanced HIV/AIDS, organ transplant recipients) due to rare case reports of probiotic sepsis. Pregnant and breastfeeding women should consult their obstetrician before starting any new supplement, though psyllium and prunes are typically considered safe in pregnancy.

Comparison Tables: Evidence, Dosing, and Safety

Structured data helps you quickly compare your options and match therapies to your individual situation.

Evidence Comparison Table

TherapyEvidence SourceAGA/ACG GRADETypical Trial DoseKey OutcomesMain Safety IssuesPrunes (dried plums)RCT (2011)Food-based (not graded)50-100 g/day (5-12 prunes)↑ CSBMs and stool consistency vs psylliumCalorie/sugar content; generally very safeKiwifruit (green)Meta-analysis (5 RCTs)Food-based (not graded)Two green kiwifruits/day↑ Frequency (p=0.0008), ↑ comfort, fewer AEs vs psylliumMinimal; allergy rarePsyllium fiberMultiple RCTsConditional5-10 g once or twice daily↑ Stool frequency and bulkBloating/gas if inadequate hydration; choking risk if dryMagnesium oxideRCT (2019, double-blind)Conditional1.5 g/day70.6% met endpoint vs 25% placebo at 28 daysHypermagnesemia in CKD/elderly; check renal functionProbiotics (B. lactis)Meta-analysesNot graded1-5 billion CFU/dayModest ↑ frequency and consistency (strain-dependent)Very safe; caution in severe immunosuppressionPEG (benchmark)Numerous RCTs, systematic reviewsStrong17 g/dayRobust ↑ in CSBMs, well-tolerated long-termElectrolyte disturbance rare; generally excellent safety

Safety & Contraindications by Therapy

TherapyContraindications/CautionsMonitoring NeededPopulation NotesPrunesDiabetes (monitor sugar intake)None requiredSafe in pregnancy; monitor calories if weight concernKiwifruitKiwi allergy (rare)None requiredSafe across age groups and pregnancyPsylliumBowel obstruction, dysphagia (aspiration risk)None requiredSafe long-term; ensure adequate hydration (8-10 glasses/day)Magnesium oxideCKD (eGFR <60), severe renal impairmentBaseline: serum creatinine, eGFR; consider serum Mg at 2-4 weeks if elderly/CKDElderly and CKD highest risk for hypermagnesemia; dose-dependent diarrheaProbioticsSevere immunosuppression (HIV, transplant, chemo)None requiredGenerally very safe; choose strain-specific products (B. lactis)Aloe (avoid)All patients, FDA removed OTC approval; IARC carcinogen concernN/A, do not useNot recommended for any population

Frequently Asked Questions

Q: What natural supplements are proven to increase bowel movements?

Five evidence-backed options are prunes (dried plums), two green kiwifruits daily, psyllium fiber, magnesium oxide (1.5 g/day in RCTs), and specific probiotics like Bifidobacterium lactis. Start with fiber or food-based therapies (psyllium, prunes, or kiwifruit) for 2-4 weeks, then escalate to osmotic agents like magnesium oxide or PEG if needed. All five have randomized trial or meta-analysis support and align with the 2023 AGA/ACG clinical guideline.

Q: How effective are prunes and kiwifruit compared with fiber supplements like psyllium?

In head-to-head randomized trials, prunes improved weekly complete spontaneous bowel movements and stool consistency more than psyllium. A separate meta-analysis of five RCTs found that two green kiwifruits daily significantly increased defecation frequency (p = 0.0008) and improved abdominal comfort versus control, with fewer adverse events than psyllium. Both prunes and kiwifruit offer multi-mechanism benefits (fiber, natural osmotic compounds, enzymes) that may explain their superior tolerability and efficacy in some patients.

Q: What dose of magnesium oxide was used in clinical trials, and is it safe?

The pivotal double-blind RCT used 1.5 grams per day of magnesium oxide, which resulted in 70.6% of participants meeting the primary endpoint versus 25.0% with placebo after 28 days. However, magnesium oxide requires renal function assessment before use; check serum creatinine and eGFR to rule out chronic kidney disease. Elderly patients and those with impaired kidney function risk hypermagnesemia (elevated blood magnesium), which can cause cardiac arrhythmias and muscle weakness. Use only under medical supervision in at-risk groups.

Q: Which probiotic strains help constipation and how should they be used?

Bifidobacterium lactis strains (including BB-12 and HN019) are most frequently cited in meta-analyses showing modest improvements in stool frequency and consistency. Efficacy is highly strain- and dose-dependent, so look for products that list a specific B. lactis strain identifier and provide 1-5 billion CFU per serving. Trial the probiotic for at least 4 weeks while tracking complete spontaneous bowel movements per week and Bristol Stool Scale scores. Probiotics work gradually by modulating gut microbiota and colonic motility signaling.

Q: How do I sequence natural supplements with OTC medicines like PEG?

Follow a stepped approach: (1) Start with fiber or food-based therapy (psyllium, prunes, or kiwifruit) for 2-4 weeks. (2) If response is inadequate, add an osmotic agent, PEG (strong guideline recommendation) or magnesium oxide (conditional; requires renal check). (3) For refractory constipation after 4-6 weeks of optimized therapy, consult a clinician for prescription secretagogues or prokinetics. Avoid chronic stimulant laxative use (senna should be only short term). This sequencing aligns with the 2023 AGA/ACG guideline recommendations.

Q: Are there any natural laxatives to avoid for safety reasons?

Yes, avoid aloe vera-based stimulant laxatives. The FDA removed OTC approval for aloe-containing laxatives due to insufficient safety data, and the International Agency for Research on Cancer (IARC) classified whole-leaf aloe extract as possibly carcinogenic to humans. Additionally, use stimulant laxatives like senna only short-term (1-2 weeks maximum) per guideline recommendations, as chronic use may lead to dependency and colon changes. Stick with evidence-based osmotic agents (PEG, magnesium oxide) or food-based therapies for long-term management.

Q: How long should I try a supplement before assessing benefit?

For fiber or food-based therapies (psyllium, prunes, kiwifruit), allow 2-4 weeks for full benefit; fiber effects emerge gradually as gut microbiota adapt and stool bulk increases. The magnesium oxide RCT assessed outcomes at 28 days, so give osmotic agents at least 4 weeks at a stable dose. Track your response using objective metrics: count complete spontaneous bowel movements per week (CSBMs) and assess stool consistency with the Bristol Stool Scale (target type 3-4). If zero improvement after 4 weeks of optimized therapy, schedule a medical evaluation.

Sources, Methodology, and Medical Review

Evidence Selection and Methods

This guide is anchored to the 2023 American Gastroenterological Association (AGA) and American College of Gastroenterology (ACG) joint clinical practice guideline on the management of chronic idiopathic constipation in adults, the highest-authority, most current consensus document in the field. We supplemented guideline recommendations with primary evidence from randomized controlled trials and systematic reviews/meta-analyses for therapies specifically highlighted in the guideline or with strong trial-level support: prunes (RCT, 2011), kiwifruit (meta-analysis of five RCTs), magnesium oxide (double-blind RCT, 2019), psyllium (multiple RCTs synthesized in guideline), and probiotics (strain-specific meta-analyses).

Our search and inclusion criteria prioritized: (1) the 2023 AGA/ACG guideline as the primary framework; (2) randomized controlled trials with ≥50 participants and clearly defined constipation endpoints (CSBMs, Bristol Stool Scale); (3) systematic reviews and meta-analyses published in peer-reviewed journals; and (4) regulatory guidance from the FDA and IARC for safety assessments (aloe warnings). The last evidence review was completed in January 2025 to ensure inclusion of the most recent guideline and trial data available through 2024.

Medical Review & Transparency

Content reviewed by: This article was developed by the Let Loose clinical content team in collaboration with board-certified gastroenterology consultants. Medical review completed January 2025.

Conflicts of interest: Let Loose manufactures an oxygenated magnesium formula for digestive health. This guide includes magnesium oxide as one evidence-based option among five, based on published RCT data and guideline recommendations. All cited evidence is publicly available and independently verifiable. No financial relationships exist between Let Loose and the manufacturers of prunes, kiwifruit, psyllium, or probiotic products discussed.

Next evidence review: Planned for Q2 2026 or sooner if major guideline updates or high-impact RCTs are published.

Disclaimer: This content is for educational purposes and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement or treatment for constipation, especially if you have underlying medical conditions, take medications, or experience alarm features (GI bleeding, unexplained weight loss, severe abdominal pain).