Every intervention Outliyr has scored for gut health, ranked by its BioHarmony score for this use case rather than its overall rating. The number beside each name is how well that one thing works for gut health; the tier beside it is what it is worth once safety, cost and effort are counted across everything else.
43 of 103 evaluated interventions score 3.0+ out of 10 for gut health · 11 comparisons
Vasireddi 2025 anchors the most relevant signal. BPC-157 fits gut health when the target is tissue repair, vascular recruitment, or inflammation control, but the case still rests mostly on preclinical models. The…
Berthon et al. 2026 supports the core mechanism. Gut-health support remains credible because lactoferrin acts in the intestinal lumen, binds iron, supports barrier function, and can favor Bifidobacterium-like ecology. The neonatal MAGPIE/ELFIN…
Dalmasso 2008 reports KPV uptake through PepT1 and reduced intestinal inflammation in DSS and TNBS mouse colitis models. Xiao 2017 points in the same direction, but route, dose, baseline status, and outcome…
Soh 2024 anchors the most relevant signal. Glycine fits gut health because glycine participates in sleep signaling, glutathione, collagen, methylation, and nervous-system balance, depending on the endpoint. The score stays bounded because…
Dhillon 2024 reports 25-article systematic review; mixed preliminary clinical evidence, heterogeneity, and need for stronger trials. Zhou 2024 points in the same direction, but route, dose, baseline status, and outcome tracking decide…
Bovine colostrum has one of its clearest signals in gut permeability: Halasa 2017 found improved lactulose/mannitol and stool-zonulin changes in athletes, while Hajihashemi 2024 pooled RCTs and found reduced permeability ratios. Clinical…
The vagus-gut axis is direct and clinically relevant; gut-motility and IBD studies are emerging, but consumer tVNS has not yet proven a reliable gut-health effect. The score stays bounded because Vagus Nerve…
Metformin modestly alters gut bacteria, increasing Akkermansia and short-chain-fatty-acid producers, which may support intestinal barrier function. However, these microbiome shifts appear secondary to Metformin's primary action of reducing hepatic glucose production and…
The evidence points to a plausible use case without proving a universal response. Dai W et al. 2024 is the best anchor here because it reports 19 randomized trials, 568 participants and…
Bile-acid physiology makes digestive tolerance and bile-flow questions plausible, but direct wellness evidence is still narrow. The strongest relevant clinical context comes from Larghi 1997 in PBC and Pan 2013 in liver…
Hagiyama 2024 reports 12 RCTs; 622 patients; low-certainty improvement in patient-reported outcomes and very-low-certainty strength signal after lower-limb surgeries. Wittholz 2024 points in the same direction, but route, dose, baseline status, and…
This explains much of the interindividual variability in response. Human outcome data tying polyphenol-driven microbiome shifts to hard endpoints is still developing, which keeps the score mid-range.
Menon 2025 anchors the most relevant signal. Lion's Mane fits gut health when the goal is gentle mushroom-based support for cognition, mood, nerve biology, or gut-immune signaling over weeks. The score stays…
Gut health is butyrate's core use, and the signal is real but modest. Two small 2025 ulcerative colitis trials are the best evidence, including a microencapsulated sodium butyrate add-on study (n=98) that…
For ulcerative colitis specifically, curcumin has a real adjunct signal. A 2018 meta-analysis in the American Journal of the Medical Sciences found an odds ratio of 6.78 for clinical remission when curcumin…
Berberine has antimicrobial and gut-signaling effects, and Chen 2023 supports a berberine-containing H. pylori regimen. That does not make chronic use gut-friendly. The practical score is split: useful in short antimicrobial protocols,…
Gut evidence is mixed and dominated by H. pylori work. Yanaka 2009 reported that 70 grams of broccoli sprouts per day reduced urease breath and stool antigen markers during treatment in 48…
Fucoidan is a sulfated polysaccharide that resists digestion and reaches the colon, where preclinical work shows prebiotic-like shifts and mucosal protection. The habitual seaweed intake of Japanese populations even drove transfer of…
Takeuchi 2020 randomized 98 adults to 1 liter per day of refined deep-sea water for 12 weeks and reported constipation improvement in 94 percent versus 60 percent of controls (p less than…
INSUFFICIENT_EVIDENCE for human gut-health benefit; animal autophagy and intestinal-barrier mechanisms are plausible, but GI adverse effects are a practical downside.
No direct gut-health evidence. AKG may affect intestinal metabolism in animals, but consumer Ca-AKG human evidence is absent.
Moderate exercise can improve gut motility and microbiome diversity, especially compared with inactivity. The effect is indirect and can reverse if endurance volume becomes excessive or under-fueled.
Gut-health stays exploratory. GHK reviews mention gastrointestinal lining repair and tissue remodeling, but the evidence is not direct enough for a higher score. Pickart 2015 supports general tissue repair framing, not a…
No direct gut evidence. Manufacturer claims around gut health should be treated as marketing unless supported by independent trials.
COX-2 selectivity reduces upper gastrointestinal toxicity compared with some traditional NSAID regimens, but celecoxib still carries boxed gastrointestinal bleeding, ulceration, and perforation warnings per DailyMed labeling.
Gastrointestinal tolerability is the main side-effect burden. Labeling and trial evidence consistently describe nausea, vomiting, diarrhea, constipation, and delayed gastric emptying as central risks.
Indirect via vagus-gut-brain axis; higher vagal tone linked to gut motility.
Gut-barrier benefit is indirect through immune regulation. Tian 2025 severe acute pancreatitis data are abdominal and infection-adjacent, but not a general gut-health RCT.
Chlorella supplies fermentable fiber and may shift the gut environment, and its toxin-binding works at the gut level, but dedicated human microbiome outcome trials are thin. Green stool is the most reliable…
Wang 2023 reported that pine pollen polysaccharides reduced colon injury and increased Lactobacillus abundance in DSS-colitis mice, a believable prebiotic-style effect for a fermentable polysaccharide. The score stays mid-low because this is…
HBOT has small signals in fistulizing Crohn disease and inflammatory bowel contexts. Dulai 2012 reports adjunctive benefit in selected patients, but the evidence is heterogeneous and far from microbiome-grade. Broad gut-health or…
Yu 2024 reviews gut microbiota, aging, and spermidine, but human gut-outcome RCT evidence remains limited.
Prebiotic and microbiome effects are mostly preclinical; human gut-outcome trials specific to spirulina are limited.
Gut inflammation and H. pylori-adjacent data remain mixed; animal studies are stronger than human evidence.
Gut-health signal is often negative unless fiber is deliberately protected. Standard keto commonly reduces legumes, fruit, whole grains, and fermentable carbohydrate intake, which can lower short-chain fatty acid production. Users can mitigate…
Preclinical microbiome and barrier rationale exists, including modulation of tight junctions and short-chain fatty acid producers in rodent models. No adequately powered human microbiome or barrier endpoint trial confirms a direct gut…
Exercise can support gut motility and microbiome diversity. Norwegian 4x4 is not a targeted gut protocol.
Glutathione supports gut-barrier antioxidant defense mechanistically, but human gut-outcome trials for NAC are sparse.
There is no strong human evidence that vitamin C benefits the microbiome, and high doses commonly cause osmotic diarrhea (the basis of the bowel-tolerance dosing concept), which is a gut downside rather…
Glycine may support intestinal epithelial resilience mechanistically, and collagen peptides are often used anecdotally for gut lining support. Human clinical evidence remains thin.
Oral HA is partly metabolized by gut bacteria, and some preclinical gut-barrier data exists, but human gut-outcome evidence is limited.
Sodhi 2023 reported higher risk of serious GI outcomes with GLP-1 agonists used for weight loss, and routine nausea, constipation, diarrhea, and vomiting are common.
Mushroom beta-glucans act as prebiotic fibers with animal microbiome data, but human gut-outcome trials for this trio are minimal.
Nothing matches those filters.
Monthly out-of-pocket cost at the most accessible legitimate channel, at the dose the score was given for. 13 of 43 are not priced yet; those cells are left blank rather than guessed.
| Intervention | Monthly cost | At dose | How you get it |
|---|---|---|---|
| BPC-157 | $40–$80 | 250 to 500 mcg SC 1 to 2x/day near injury site | Grey market |
| Lactoferrin | $25–$50 | 250-300 mg apolactoferrin | Over the counter |
| KPV (Lys-Pro-Val) | $40–$100 | 250-500 mcg/day oral | Grey market |
| Glycine | $2–$3 | 3 g oral glycine | Over the counter |
| Molecular Hydrogen | Not priced yet | ||
| Colostrum | $60–$80 | 20 g/day powder, split AM/PM if tolerated | Over the counter |
| Vagus Nerve Stimulation | $4–$8 | 10-20 min auricular tVNS at comfortable perceptible intensity | Over the counter |
| Metformin | $4–$30 | 500 mg with dinner for 1 week, then 500 mg twice daily for 1 week, then increase by 500 mg/week toward 1000 mg twice daily as tolerated | Prescription |
| Time-Restricted Eating | Not priced yet | ||
| TUDCA (Tauroursodeoxycholic Acid) | $12–$91 | 500-1,750 mg | Over the counter |
| Essential Amino Acids | Not priced yet | ||
| Polyphenols (Dietary) | Not priced yet | ||
| Lion’s Mane | $20–$40 | 3 g/day fruiting body extract | Over the counter |
| Sodium Butyrate | Not priced yet | ||
| Curcumin | $15–$40 | 500 mg curcuminoids | Over the counter |
| Berberine | $15–$25 | 500 mg berberine HCl three times daily with meals | Over the counter |
| Sulforaphane | $25–$60 | Broccoli sprout extract delivering about 150 micromoles sulforaphane per day | Over the counter |
| Fucoidan (Brown Seaweed Polysaccharide) | Not priced yet | ||
| Quinton Marine Plasma (Seawater Minerals) | Not priced yet | ||
| Rapamycin | $15–$50 | 3 mg | Prescription |
| Ca-AKG (Calcium Alpha-Ketoglutarate) | $15–$30 | 1 g/day generic Ca-AKG oral | Over the counter |
| Zone 2 Cardio | Not priced yet | Over the counter | |
| GHK-Cu | $30–$100 | 0.5-3% topical serum or cream | Over the counter |
| Whole-Body Vibration | $50–$100 | 30 Hz, roughly 0.3g, 10-20 min standing | Over the counter |
| Celebrex (Celecoxib) | Not priced yet | ||
| Tirzepatide | $299–$449 | 2.5 to 5 to 7.5 to 10 to 12.5 to 15 mg | Prescription |
| HRV Biofeedback | $5 | 20 min/session at individual RF (4.5 to 6.5 bpm) | Over the counter |
| Thymosin Alpha-1 | $100–$400 | 1.6 mg subcutaneous | Prescription |
| Chlorella | $10–$50 | 5-10 g/day | Over the counter |
| Pine Pollen | $20–$45 | 5 to 10 g powder per day | Over the counter |
| Hyperbaric Oxygen Therapy | $3,000–$6,000 | 2.0 ATA for 90 minutes with air breaks | In clinic |
| Spermidine | $40–$90 | 1-3 mg/day oral WGE | Over the counter |
| Spirulina | $10–$25 | 1 to 4.5 g/day | Over the counter |
| Astaxanthin | Not priced yet | ||
| Ketogenic Diet | $100 | Standard keto, 40-50 g total carbohydrate/day | Over the counter |
| Quercetin | $20–$50 | 200 mg/day | Over the counter |
| Norwegian 4×4 | Not priced yet | Over the counter | |
| NAC (N-Acetylcysteine) | $5–$15 | 600 to 1,200 mg/day | Over the counter |
| Vitamin C (Ascorbic Acid) | Not priced yet | ||
| Collagen Peptides | $8–$40 | 2.5-10 g hydrolyzed collagen peptides | Over the counter |
| Hyaluronic Acid | Not priced yet | ||
| Semaglutide | $199–$349 | 0.25 mg weeks 1 to 4, 0.5 mg weeks 5 to 8, 1.0 mg weeks 9 to 12, 1.7 mg weeks 13 to 16, 2.4 mg week 17 onward | Prescription |
| Adaptogenic Mushrooms (Reishi, Cordyceps, Chaga) | $15–$40 | 1.5 to 1.8 g/day standardized extract | Over the counter |
Head-to-head reports and category rankings that name a winner on this use case.
Lactoferrin leads gut health outright at 7.0–7.5/10, and it's a retail supplement anyone can buy with no gatekeeper and no purity-testing burden. This page ranks by the gut-health…
BPC-157 wins for acute tendon or muscle injuries, gut healing, and cost-sensitive use. TB-500 wins for cardiac tissue repair and systemic post-surgical recovery. BPC-157 scores 7.5–8.0/10 and TB-500…
No. Berberine scores 6.5–7.0/10 and semaglutide 6.0–6.5/10, and that gap misleads almost everyone who reads it. Berberine scores higher because it is cheap, oral and easy to stop,…
BPC-157 for structural repair, KPV for inflammation you cannot afford to stimulate. BPC-157 scores gut health 9.0–9.5/10 against KPV's 7.0–7.5/10 and wins nearly every other row, because it…
These two get sold as the same thing, a scoop for gut and skin, and they share almost no mechanism. Colostrum is a gut and immune product: gut…
Different jobs, same shelf. Quercetin scores 6.5–7.0/10 and curcumin 5.5–6.0/10, and that gap is the liver-safety signal rather than a difference in effect. Curcumin wins joints, inflammatory markers,…
Lion's Mane scores 7.0–7.5/10 and the reishi, cordyceps and chaga blend category scores 5.0–5.5/10. If cognition is the goal, buy the one species: lion's mane takes cognition-focus 7.0/10…
Different liver problems. NAC scores 8.0–8.5/10 and TUDCA 6.5–7.0/10, and NAC wins liver detox 8.0–8.5/10 against 6.5–7.0/10, but its liver evidence is toxin and oxidative damage. TUDCA owns…
Lactoferrin scores 7.0–7.5/10 against colostrum's 6.5–7.0/10, and lactoferrin is one protein inside colostrum. Buy lactoferrin when iron handling, acne or H. pylori is the target, at $25 to…
Metformin scores 6.5–7.0/10 and berberine 6.5–7.0/10, so the gap is meaningless. Metformin owns blood sugar with decades of outcome trials behind it. Berberine owns fatty liver, needs no…
Spirulina scores 7.5–8.0/10 and chlorella 6.5–7.0/10, so spirulina is the better default for most people. It leads on blood pressure, blood sugar, inflammation and breathing. Chlorella leads on…
BPC-157, at 9.0–9.5 out of 10 for gut health. Vasireddi 2025 anchors the most relevant signal.
Of the top-scoring options, Glycine is the least expensive at about $2 a month, scoring 6.5–7.0 out of 10 for gut health.
43 of the 103 interventions evaluated for gut health score 3.0 out of 10 or better, which is the cut-off for appearing on this page.
