Supplement · Grade B

Collagen Peptides and medications.

Not yet catalogued in the Distil interactions database. We surface that distinction explicitly.

Collagen Peptides is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.

Collagen peptides are hydrolysed protein fragments rich in glycine and proline, the building blocks of connective tissue. The Grade B evidence supports joint pain reduction and skin elasticity, with weaker Grade C support for muscle. Type matters: Type I/III hydrolysed peptides, bovine or marine, target skin and tendons, while undenatured Type II at just 40mg suits osteoarthritis, comparable in trials to a much larger dose of glucosamine and chondroitin. Marine collagen tends to absorb better for skin goals. Doses are 10 to 15g of hydrolysed peptides or 40mg of UC-II. Vitamin C is a required cofactor for collagen synthesis, so the two belong together, ideally taken around 30 to 60 minutes before joint-loading exercise per Shaw 2017. One practical note: collagen is roughly a third glycine, so 10 to 15g delivers several grams of glycine, which is safe but additive, so keep any standalone glycine at the lower end. Vegan "collagen" supplies precursors only and is not equivalent.

We have not yet completed an explicit assessment of medications for Collagen Peptides in the Distil interactions database. We surface this distinction deliberately: the Distil checker tells you when we have explicitly assessed a pair and when we have not, because both are useful information. If you take Collagen Peptides alongside a medication, the checker below will surface anything already in our database, and the missing-item form at the bottom of the page routes uncatalogued pairs into our next curation pass.

What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.

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For adults over 18. This tool gives evidence-graded information, not medical advice. Always discuss changes with your GP, especially if you take any medication, are pregnant, breastfeeding, or have a serious health condition.

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Your supplements

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How we decide

How we grade severity, choose what's in scope, and what we exclude.

Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.

Read the full methodology

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Distil's interactions database is reviewed and updated every quarter. We grade evidence transparently and publish our methodology, including every database change, at /about/methodology. This tool is information, not a substitute for clinical judgement. If you take medication and supplements together, your GP or pharmacist can review your full regimen against your medical history. If you want a full personalised stack reasoned against this same database, the Distil report is the next step up.