Know2eat

Zinc carnosine

Probiotics & Gut

What zinc carnosine may help with

Ranked by how strong the human evidence is — best supported first.

Best supportedDigestive comfortLimited evidence· 4 sources

Then, in order

About Zinc carnosine

A chelate of zinc and the dipeptide carnosine that dissolves slowly and adheres to ulcerated mucosa. It behaves differently from ordinary zinc salts because the intact complex, rather than the free zinc, appears to be what acts on the gastric lining.

Zinc carnosine is a prescription gastric medicine in Japan, approved there for gastric ulcer since 1994, and a supplement everywhere else — one of the clearer examples of the same molecule sitting on opposite sides of the regulatory line. The Japanese clinical literature is substantial but largely published domestically and not always in English; the most-cited Western study is a small mechanistic trial in ten volunteers showing that zinc carnosine reduced the increase in small bowel permeability caused by indometacin. That is a real and interesting finding in a very small sample, and it is close to the whole Western evidence base.

Sold as
Tablet, Capsule, Granules
Standardised to
Usually 75 mg polaprezinc, supplying roughly 16 mg elemental zinc — a product without this marker may not resemble what was studied.
Also known as
Polaprezinc, Zinc L-carnosine, PepZin GI

Regulation: Approved as a prescription drug for gastric ulcer in Japan; sold as a dietary supplement elsewhere with no pre-market efficacy review. Because it supplies elemental zinc, it counts towards zinc intake and against the tolerable upper limit of 40 mg/day for adults.

What the research used

The amounts, forms and durations published trials of Zinc carnosine actually administered.

These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.

  • Studied for Gastric mucosal protection and NSAID-induced permeability

    75–150 mg

    Limited

    Polaprezinc daily, divided · 2–8 weeks

    The standard Japanese therapeutic dose is 150 mg/day in two divided doses. Most Western supplement products supply 75 mg/day, which is half the studied amount.

This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

None of the timings below were directly compared in a trial. They reflect how the research happened to dose, or what the pharmacology implies — which is not the same as a timing being better.

  • On an empty stomach

    Not enough

    Often taken between meals so the complex can adhere to the gastric mucosa without competing with food. That reflects the proposed mechanism rather than a tested comparison, and taking zinc without food increases nausea for some people.

    Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

The evidence in depth

Best supported: Limited

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.

Digestive comfort

Gut & Digestive Health
Limited evidence

Japanese clinical work supports zinc carnosine for gastric ulcer, where it is licensed, and a small Western trial showed it reduced the rise in small bowel permeability caused by a non-steroidal anti-inflammatory drug. Outside those settings the evidence for general digestive complaints is thin.

What may be going on: The intact complex adheres to ulcerated mucosa and has been reported to stabilise membranes and support mucosal repair, effects not reproduced by zinc salts alone.

Limited evidence. Early human work, or mostly lab and animal research.

View the 4 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Inflammatory markers

Inflammation
Not enough evidence

Laboratory and animal work describes antioxidant and mucosal protective effects. There is not enough human research to say zinc carnosine changes inflammatory markers.

Not enough evidence. Not enough human research to say anything useful yet.

View the 3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Things to know

Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.

  • Too much

    Counts towards total zinc intake

    Each 75 mg of polaprezinc supplies about 16 mg of elemental zinc. Combined with a multivitamin or a separate zinc supplement it is easy to exceed the 40 mg/day upper limit, and chronic excess zinc causes copper deficiency, which can present as anaemia and neurological problems.

  • Interaction

    Reduces absorption of some antibiotics

    Interacts withTetracyclines, fluoroquinolones, penicillamine

    Zinc binds tetracycline and quinolone antibiotics in the gut and reduces their absorption. Doses should be separated by several hours.

  • Worth knowing

    Not a substitute for investigating ulcer symptoms

    Persistent upper abdominal pain, vomiting, weight loss or black stools need medical assessment. Treating them with a supplement can delay diagnosis of ulcer disease, Helicobacter pylori infection or malignancy.

  • Too much

    Nausea on an empty stomach

    Zinc compounds commonly cause nausea when taken fasted, which is the practical tension with the way this one is usually dosed.

Evidence ratings on this page: 1 limited evidence, 1 not enough evidence.

Supplements are sold in the US without pre-market review of efficacy or safety. Nothing on this page is a recommendation to take Zinc carnosine, or a dose to follow.