Zinc-L-carnosine · supplement
Evidence tier: limited
A specialised form of zinc that sticks to the stomach lining to support ulcer healing and gastric mucus production.
Not a nutrient delivery story, a topical one. The chelate is poorly dissolved and adheres to ulcerated and inflamed mucosa, where zinc is thought to bind albumin and other proteins to form mixed ligand complexes that stick at the lesion, while the carnosine half scavenges oxygen radicals. It is reported to stimulate mucus production and to help maintain the integrity of the gastric mucosal barrier. The important consequence of this mechanism is that the compound is believed to work by SITTING ON damaged tissue, which is a coherent story in someone with an actual ulcer and a much weaker one in a healthy person with an intact gut.
This one needs a precise distinction rather than a grade, because the honest answer depends entirely on which product you think you are buying. Zinc L-carnosine, known as polaprezinc, is a synthetic 1:1 chelate that has been a PRESCRIPTION DRUG in Japan since 1994, licensed for gastric ulcer at 150 mg daily (75 mg twice daily, supplying about 34 mg elemental zinc and 116 mg L-carnosine), and it is also approved in Korea and China. That licence is real and it is backed by real randomised trials: the registration era multicentre double blind trial in 299 gastric ulcer patients reported endoscopic healing of 60.4 percent at 8 weeks, and a 2022 multicentre randomised double blind trial found it comparable to rebamipide (81.5 percent versus 74.3 percent, p = 0.16, a positive controlled non inferiority design with no placebo arm). As an adjunct to H. pylori triple therapy, a 2022 meta analysis (PMID 36235778) found improved eradication (80.4 percent versus 67.0 percent intention to treat), but graded the evidence VERY LOW certainty by GRADE, on 3 single centre trials in only 396 people with high risk of bias. That is the whole picture, and every part of it is a MEDICAL indication, in a diagnosed disease population, under a doctor, in East Asia. Now the part that matters for a supplement: the Western consumer claim, gut lining, gut barrier, so called leaky gut, does NOT rest on any of that. It rests almost entirely on one study, Mahmood et al. 2007 in Gut (PMID 16777920), which was 10 healthy volunteers in a crossover, given indomethacin for 5 days, with the outcome being a lactulose to rhamnose permeability RATIO, a laboratory surrogate, not a symptom, not a clinical outcome. Ten people and a surrogate endpoint is not a validated gut health claim. Much of the supporting literature is Japanese language and originates with or is linked to Zeria Pharmaceutical, the originator company. Honest verdict: LIMITED for anything PlantRx can legitimately say to a consumer.
150 mg daily of zinc L-carnosine, taken as 75 mg twice daily with food, which is the licensed Japanese gastric ulcer dose and the dose used in the trials; the treatment course in those trials ran 4 to 8 weeks. Note what that dose actually contains: about 34 mg of elemental zinc. That is not a trivial amount of zinc. It sits just under the 40 mg per day Tolerable Upper Intake Level for adults, so it leaves almost no headroom for any other zinc supplement or a zinc containing multivitamin, and it carries zinc's full interaction and copper depletion profile with it.
75 mg twice daily with food, for 4 to 8 weeks.
Generally well tolerated. Take separately from antibiotics.
Pregnancy: caution
Breastfeeding: caution
Active compounds: zinc, L-carnosine
Remedies using Zinc Carnosine · Browse by body system · Check it against what you take
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.