About 26,000 searches a month ask which foods are high in collagen. Most answers list foods, then drift into "collagen-boosting" berries and citrus, without a single gram figure. The reason for the missing figure is structural: the main US food database does not measure collagen at all. This page reports the numbers that do exist, where they come from, and how much food they imply against the amounts used in the collagen trials.
It reports amounts; it does not recommend a diet or a dose.
Why the food tables have no collagen number
USDA FoodData Central, the reference most nutrition sites draw on, has no collagen field. Searching its Foundation and SR Legacy data for "collagen" returned no foods on 6 October 2026. Even gelatin, which is collagen that has been boiled out of skin and bone, is listed only by its protein and amino acids: unsweetened dry gelatin (FoodData Central record 169599) carries 85.6 g protein, 19.0 g glycine and 12.3 g proline per 100 g, and no figure for hydroxyproline.
Hydroxyproline matters because it is how collagen is measured: laboratories hydrolyse a food, measure its hydroxyproline as the marker of collagen and convert; the method was validated in an 18-laboratory study and adopted by AOAC (Kolar 1990). Meat scientists use it routinely, because collagen makes meat tough. Their measurements, made for tenderness research, are the best collagen figures for food that exist.
What has been measured
| Food (raw) | Collagen measured | Per 100 g | Source |
|---|---|---|---|
| Pork loin (longissimus) | 4.1 mg/g | 0.41 g | Wheeler 2000, 23 pigs, USDA research centre |
| Pork ham muscles (semimembranosus to biceps femoris) | 4.5–7.1 mg/g | 0.45–0.71 g | same |
| Pork shoulder (triceps brachii) | 6.0 mg/g | 0.60 g | same |
| Atlantic salmon, white muscle | 2.9 g/kg | 0.29 g | Aidos 1999 |
| Beef mince, UK retail (18 shops) | 1.4–4.4% | 1.4–4.4 g | Hudson 1986 |
| Gelatin, dry powder | — | ~85.6 g protein, nearly all collagen-derived | FoodData Central 169599 |
Two things stand out. Lean muscle carries little collagen: under a gram per 100 g in every pork muscle and in salmon. And mince varies threefold, because grinding takes in connective tissue and trimmings; the cheaper and more sinewy the mince, the more collagen. The richest whole foods (pork skin, chicken feet, tendon, oxtail, fish skin) are rich precisely because they are mostly connective tissue, but no figure for them appeared in the US tables or in the measurements opened for this page, so none is given.
Slow, moist heat turns collagen into gelatin, which is why braised cuts and stocks set when cold. The figures above were measured raw, and none of these studies measured what cooking leaves in the meat versus the liquid.
Against the trial doses
The collagen trials reported on this site used 15 g a day in the muscle studies, 5–10 g for joints and 5 g for tendon and bone; each is set out on how much collagen per day. Here is how much of each measured food matches those amounts, if all its collagen counted:
| Food | For 5 g of collagen | For 15 g of collagen |
|---|---|---|
| Pork loin | ~1.2 kg | ~3.7 kg |
| Pork ham, highest-collagen muscle | ~700 g | ~2.1 kg |
| Salmon fillet | ~1.7 kg | ~5.2 kg |
| Beef mince, 1.4–4.4% | ~115–360 g | ~340 g–1.1 kg |
| Gelatin powder | ~5.8 g | ~17.5 g |
This arithmetic is ours, from the measured figures above, and it assumes food collagen and a supplement's hydrolysed collagen behave alike, which no trial has tested. It shows why the trials used supplements: from lean meat and fish the amounts are impractical, while gelatin, the concentrated food form, reaches them in a spoonful or two. Gelatin was one of the 20 g reference proteins in the Australian Institute of Sport's comparison on the bone broth collagen page, where it supplied 4.8 g of glycine per serving.
Bone broth sits between the two and varies too much for one figure; that page sets out the measurements.
"Collagen-boosting" foods
Plants make no collagen, so a plant food can only supply nutrients the body uses to build its own. Of these, one has a regulator's backing. The EU's list of permitted health claims has exactly one collagen claim, and it belongs to vitamin C: "contributes to normal collagen formation", authorised in six versions, for blood vessels, bones, cartilage, gums, skin and teeth (Regulation (EU) No 432/2012). No other food or nutrient on the list carries a collagen claim.
Supplements follow the same logic. The NIH Dietary Supplement Label Database holds 11 on-market labels sold as vegan or plant-based collagen "builders" or "boosters" (read 6 October 2026). Eight list vitamin C; none contains collagen; the rest of their formulas vary (amino acids, silica from bamboo, pea protein). A "vegan collagen" product is a vitamin-and-amino-acid product. Whether vitamin C beyond ordinary intake adds anything for tendons or joints is a separate question that these labels do not answer.
Where creatine comes into it
Readers who arrived from the creatine side will notice the overlap: the same animal foods carry both. Foods high in creatine does the same arithmetic for creatine, and meat and fish come out the other way round, rich in creatine and poor in collagen. How collagen protein compares with whey for building muscle is on collagen versus whey. Skin outcomes are outside this site's beat; Peptide Glow Journal covers them on collagen peptides for hair and skin.
What is not established
- Collagen content of skin, feet, tendon and other connective-tissue foods in a public food table. The figures exist only scattered through meat-science papers.
- Whether food collagen does what supplement trials report. No trial has used food.
- Whether "collagen-boosting" foods raise the body's own collagen beyond what normal vitamin C intake already does.
Anyone choosing foods for a medical reason, such as wound healing or a joint condition, has a clinician or dietitian to ask.
Sources and dates
- USDA FoodData Central: Foundation and SR Legacy search "collagen" (0 foods); Gelatins, dry powder, unsweetened, FDC record 169599 (read through the FoodData Central API); read 2026-10-06.
- Kolar K. Colorimetric determination of hydroxyproline as measure of collagen content in meat and meat products: NMKL collaborative study. J Assoc Off Anal Chem 1990;73:54–7, PMID 2312514.
- Wheeler TL, Shackelford SD, Koohmaraie M. Variation in proteolysis, sarcomere length, collagen content, and tenderness among major pork muscles. J Anim Sci 2000;78:958–65, PMID 10784186.
- Aidos I, Lie O, Espe M. Collagen content in farmed Atlantic salmon (Salmo salar L.). J Agric Food Chem 1999;47:1440–4, PMID 10563996.
- Hudson WR et al. The bacteriological quality, fat and collagen content of minced beef at retail level. Meat Sci 1986;17:139–52, PMID 22055219.
- Commission Regulation (EU) No 432/2012, Annex, vitamin C entries, EUR-Lex CELEX 32012R0432, read 2026-10-06.
- NIH Dietary Supplement Label Database API v9, search "vegan collagen": 11 on-market builder/booster labels, ingredients read; 2026-10-06.