How much is too much collagen per day?

Too much by reason: skin, joints, the tendon protocol, and muscle

How much is too much collagen per day is usually asked as if there were one number, and the honest answer is that there are four, because too much is relative to the reason a reader is taking it before it is absolute, and a dose that is exactly right for one reason is twice too much for another. For skin, the oral collagen trials gave 2.5 to 10 grams a day for eight to twelve weeks and measured elasticity and hydration by instrument, and no skin trial gave more than ten, so a reader taking collagen for skin is past every skin trial at eleven grams and is paying, at four calories a gram and pence per gram, for grams no skin study ever tested; ten is the skin ceiling, and 2.5 grams, the low end that the eight-week wrinkle depth trial used, is a reminder that the skin band starts low. For joints, the comfort trials gave around ten grams a day for twelve to twenty-four weeks, with a few at fifteen and some at five, so ten is the usual joint dose and fifteen the top of the joint data, above which no joint trial speaks. For the tendon pre-loading protocol, the one timed collagen dose, the trial gave around fifteen grams of gelatin with roughly 50mg of vitamin C an hour before loading, and fifteen is therefore both the protocol's dose and the highest dose any collagen protocol has used for any reason, the ceiling of the whole evidence base. For muscle, the answer is different in kind: every gram is too much, because collagen lacks tryptophan entirely, scores near zero on the completeness scale and carries around a third of whey's leucine, so it does not build muscle in the trials that compare it with whey and does not count toward the 1.6 grams per kilo a lifter eats for it, and a reader taking twenty grams for muscle has taken twenty grams too many and should have taken whey. Set those four ceilings against the tub and the tub loses: a standard scoop holds around twenty grams, a serving size chosen by the brand and not a dose chosen by any trial, and a reader following the scoop is over the skin ceiling by double, over the joint ceiling, over the tendon protocol, and over the muscle ceiling by twenty grams, every day, which is why the first answer to how much is too much is whatever the scoop says.

The absolute ceilings behind the relative ones, and the reader-specific one

Behind the four relative ceilings sit the absolute ones, and they are gentler than the question expects. First, there is no upper level: no authority in the UK, Europe or elsewhere has set a tolerable upper intake for collagen or gelatin, because they are food proteins with no toxicity to set a limit against, so no daily dose of collagen is poisonous in the way a vitamin or mineral can be, and the word overdose does not apply to it. Second, fifteen grams is where the data ends: the trials ran up to fifteen grams a day for months without an adverse event above placebo, and above fifteen no trial speaks, so a reader at twenty or thirty grams is not in danger but is off the map, taking protein no study measured for any outcome, which is the difference between unsafe and unstudied and should be stated as one. Third, the gut sets its own ceiling: twenty grams of any protein in a glass produces fullness and bloating in many readers, especially fasted or late, fading over a fortnight as the gut adapts and absent at a dessertspoon, so the point at which a dose becomes uncomfortable is around a scoop and is the body's own too much. Fourth, the ledger: collagen is four calories a gram and an incomplete protein, so grams above the reason are calories added and, if counted as protein, complete protein displaced from the day, the practical cost of too much for a lifter tracking either. Then the reader-specific ceiling, which is the only one that could matter clinically: hydroxyproline, around a tenth of collagen, is metabolised partly to oxalate, and urinary oxalate rises after large gelatin loads, so a reader who has formed calcium oxalate kidney stones has a lower too much than anyone else, keeps collagen and gelatin modest and asks whoever manages the stones, while a reader with no stones has no such ceiling. The ceilings totalled: too much is any gram past the reason, ten for skin, fifteen for joints and the protocol, none for muscle; the scoop is over all of them; nothing is toxic, fifteen is the end of the data, fullness is the gut's limit, and stone formers have a lower line. The worked example sits under every ceiling on the page: 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, below the research band, a dose no reason on this page calls too much and taken for vitamin C's collagen formation sentence rather than for any of the trials' grams. How much is too much collagen per day: more than the reason needs, which the tub's scoop is for every reason there is.

What to check on the label