The short answer · Intestinal permeability
Take l-glutamine for intestinal permeability. This is the one to buy.
California Gold Nutrition, Sport, L-Glutamine Powder, AjiPure®, Gluten Free, 1 lb (454 g)
4.7· 12,635 ratings· $0.26/serving
L-Glutamine 5 g — inside the studied 5-15 g window
Of 915 products scored for Intestinal permeability, California Gold Nutrition, Sport, L-Glutamine Powder, AjiPure®, Gluten Free, 1 lb (454 g) ranks #1 with a DoseRank score of 85. L-Glutamine is the strongest evidence signal for this outcome.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why L-Glutamine — not Tributyrin?”Evidence Strong evidence
L-Glutamine is the strongest evidence signal for this outcome.
- L-GlutamineThe pick
Strong evidence · 5 g
The most abundant amino acid in muscle and plasma; conditionally essential during illness or hard training, it fuels intestinal cells and supports gut barrier integrity.
- Tributyrin
Moderate evidence · 1200 mg
A triglyceride form of butyrate, a short-chain fatty acid that fuels colon cells; more stable and better absorbed than free butyric acid, used for gut barrier support.
The dose“Is the dose actually effective?”Dose fit 67
L-Glutamine at 5 g lands inside the studied 5-15 g window.
L-Glutamine
Studied window 5-15 g · this pick 5 g
The ranking“Why should I trust this pick?”Trust 92
Strong trust signals — consistently high marks from verified buyer ratings. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.
- 915 products scored
- Never paid placement
- Evidence level: Strong · 92
- 169 brands
- 7 ingredients
The price“Can I do better than $0.26 a serving?”Value 81
$0.26 per serving — low price tier for this outcome. The cheapest ranked pick here is $0.13 per serving.
- 2Nutricost, L-Glutamine, Unflavored, 35.7 oz (1 kg)Score 85 · $0.13/servingiHerb
- 6NOW Foods, Sports, L-Glutamine Powder, 2.2 lbs (1 kg)Score 84 · $0.22/servingiHerb
Why not the absolute cheapest? The DoseRank score also weighs clinical strength, evidence, dose fit and trust — the very cheapest listings rarely hold up everywhere else.
Ready?
The #1 pick is $0.26 a serving.California Gold Nutrition, Sport, L-Glutamine Powder, AjiPure®, Gluten Free, 1 lb (454 g) — in stock at a tracked retailer.
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Frequently asked
California Gold Nutrition, Sport, L-Glutamine Powder, AjiPure®, Gluten Free, 1 lb (454 g) ranks #1 for Intestinal permeability with a DoseRank score of 85. The score blends clinical strength, evidence, dose fit, trust signals and value across 915 products scored for this outcome.
L-Glutamine is the strongest evidence signal for this outcome.
L-Glutamine at 5 g lands inside the studied 5-15 g window. DoseRank scores this product's dose fit at 67 out of 100.
California Gold Nutrition, Sport, L-Glutamine Powder, AjiPure®, Gluten Free, 1 lb (454 g) works out at $0.26 per serving. $0.26 per serving — low price tier for this outcome. The cheapest ranked pick here is $0.13 per serving.
No. Retailer links may be affiliate links, but rankings and placement are never paid. Every product is scored by the same public model, and the ranking is recomputed from the underlying product data rather than edited by hand.