What to avoid when taking collagen?

Columns one to three: the glass, the habit and the label

What to avoid when taking collagen produces a shelf answer that is mostly wrong, a list of foods and drinks supposedly blocking it, and the honest page replaces the list with five columns, because the things worth avoiding are not in the glass at all. Column one, the glass: avoid nothing. Collagen is a food protein, digested like any other into peptides and amino acids, and it has no documented interactions with medicines, no absorption fights with minerals or other proteins, and no sensitivity to the things forum lists warn about, since coffee does not denature a peptide that has already been hydrolysed, dairy does not bind it, sugar does not glycate it in a cup, and the heat of a hot drink does nothing to fragments that were made by heat and enzymes in the first place, while the vitamin C the lists sometimes warn against is the cofactor for the enzymes that cross-link collagen and the one ingredient a collagen label is allowed a sentence about. Column two, the habit: avoid counting the scoop as the day's protein. A twenty-gram scoop is protein on the label by the nitrogen test and protein of the wrong shape for muscle, lacking tryptophan entirely, near zero on the completeness scale and carrying around a third of whey's leucine, so a reader who books it toward a 1.6 grams per kilo target has under-eaten complete protein by a scoop, and the habit to avoid is that arithmetic, the fix being to book collagen separately as connective tissue protein and eat the day's complete protein as usual. Column three, the label: avoid three things. A proprietary blend that lists collagen in a mix with a total weight and no breakdown, so the grams of collagen cannot be read; a milligram dose, 500mg or 1000mg in a capsule, presented in language borrowed from the trials at 2.5 to 15 grams, as if the two were the same thing, which the honest label avoids by printing the dose plainly and describing it on its true terms; and a tub that will not state the type and the source, type 1 or 2, bovine, marine or porcine, since the type decides whether it is the tendon and skin molecule or the small-dose undenatured type II one, and the source decides whether a fish-allergic or pescatarian or observant reader can take it.

Columns four and five: the person and the hope, and the columns totalled

Column four, the person: four groups have something to avoid, and none of them is the general reader. A reader who has formed calcium oxalate kidney stones avoids treating collagen and gelatin as a daily twenty grams, because hydroxyproline is metabolised partly to oxalate and large gelatin loads raise urinary oxalate in the feeding studies, so that reader keeps it modest and asks whoever manages the stones. A fish-allergic reader avoids marine collagen, which is hydrolysed fish skin and scale protein, the allergen itself rather than a refined oil, and chooses bovine. A reader with kidney disease avoids adding any protein supplement without asking the kidney team, since protein intake in kidney disease is set clinically and a collagen scoop is protein, the general population's reassurance that higher protein has not harmed healthy kidneys in trials being an answer for a different population. And a reader under eighteen avoids supplement advice from this site altogether, which gives none for that age. Column five, the hope: avoid the claim. Collagen holds no authorised claim in the UK for skin, joints, hair, nails, bones, muscle or anything else, so a tub promising any of those is either borrowing vitamin C's collagen formation sentence or zinc and biotin's normal skin lines from the ingredients beside it, or saying something the register does not permit, and the reader who avoids the hope buys collagen for what the trials showed at 2.5 to 15 grams, instrument gains in skin at 2.5 to 10 grams over two to three months, modest joint comfort at ten grams over months, synthesis markers at fifteen grams with vitamin C before loading, and expects nothing a mirror will show in a fortnight. The columns totalled: nothing in the glass, one habit, three label faults, four groups of person, and one hope, which is a shorter and more useful list than the foods to avoid the shelf offers, none of which matter. The worked example passes column three by printing its dose plainly and describing it on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, the type and source stated, the dose below the research band and taken for the vitamin C line, and marine, so the fish-allergic reader in column four passes it by for bovine. What to avoid when taking collagen: not the coffee, not the dairy, not the heat, but the arithmetic, the blend, the milligrams dressed as grams, the footnotes for four groups, and the claim that does not exist.

What to check on the label