What will happen if I take collagen every day?

Hours: the gut, the blood, the liver and the kidneys

What will happen if I take collagen every day is a question whose common variant, what happens to your body, invites a story about transformation, and the honest page answers both by doing something more literal, following one day's dose through the body organ by organ and reporting what each organ actually does with it, because the body's answer is more specific and less dramatic than the shelf's. The dose enters the stomach as hydrolysed collagen, type I collagen already broken by enzymes at manufacture into short peptides, in a capsule's gelatin shell or stirred into a drink, and the stomach's acid and pepsin begin cutting the peptides further; in the small intestine the pancreatic enzymes and the brush border enzymes finish the job, and within an hour or two the dose has become what every protein becomes, free amino acids, in collagen's case a third glycine with proline, hydroxyproline, alanine and the rest, plus a small fraction of di- and tripeptides that resist digestion, prolyl-hydroxyproline and hydroxyprolyl-glycine among them, which are absorbed intact across the gut wall. In the blood, the amino acids and peptides rise within thirty minutes, peak around an hour and are cleared over the following hours, the amino acids joining the body's pool to be used by whatever tissue is building protein at the time, the peptides circulating for a few hours before being broken down or excreted; by evening a morning dose is gone from the blood, which is the pharmacokinetic reason the pre-loading protocol is timed an hour before a session and the reason nothing accumulates from one day to the next. In the liver, the amino acids are processed as any amino acids are, with one collagen-specific detail: hydroxyproline, abundant in collagen and rare elsewhere, is partly metabolised to glyoxylate and then to oxalate, so that a large daily collagen or gelatin intake raises urinary oxalate measurably in feeding studies, a fact irrelevant to most people and relevant to the minority who form calcium oxalate kidney stones, for whom a high daily dose is a conversation with their doctor. In the kidneys, the nitrogen from a gram or fifteen grams of extra protein is filtered and excreted as urea, a trivial addition to a day's load for a healthy kidney and within the range any high-protein diet imposes, with the protein and kidney literature finding no harm from high protein in people with normal kidney function and caution reserved for those with existing kidney disease, who discuss protein intake generally with their specialist. Those are the hours, and they are the same every day the habit runs: digestion, a blood peak, a liver detail, a kidney non-event, and no residue.

Weeks and months: the skin, the joints, the other tissues, and the wallet

Weeks are where the trials start to have something to report, and the honest page gives each tissue its reading. In the skin, nothing measurable happens for weeks, and then, in the oral collagen trials at 2.5g a day and above, the instruments find a change at eight to twelve weeks: a few percent improvement in elasticity and hydration measured by cutometer and corneometer against placebo, with 2.5g and 10g producing changes of similar size, a result that is real, small, invisible in a mirror and the best-replicated finding in the collagen literature; the trials used 2.5g or more, so a 1200mg capsule habit sits below the dose at which the instruments moved. In the joints, the knee osteoarthritis trials at around 10g a day read pain and function questionnaires at twelve weeks and again at twenty-four and found modest improvements against placebo in small trials, with the placebo arms also improving substantially and with no change in cartilage on imaging at any point, so the joint reading is a modest questionnaire effect in older knees and nothing structural. In the tendon, a synthesis marker doubles when 15g with vitamin C precedes a loading session, and one small six-month trial at 2.5g beside calf strengthening improved Achilles function, an adjunct beside loading rather than a daily effect. In the ligament, one six-month trial at 5g improved stability in already lax ankles. In bone, one twelve-month trial at 5g in postmenopausal women found a small density gain. In muscle, nothing: collagen's three percent leucine does not switch synthesis on, the fat-free mass trials measured a number that includes water and connective tissue, and the direct comparisons found whey worked and collagen did not. In body weight, nothing: no trial, no claim. In hair, nothing measured. In the wallet, 28p a day for a two-capsule habit and up to a pound a day for a 10g powder, every day, because every trial that found anything took its dose daily for eight to fifty-two weeks and no trial ran alternate days, so the daily part of the question is the one part the evidence insists on. What does not happen deserves its own line, since the question expects it: nothing accumulates, since protein does not build up and the peptides are cleared each day; nothing becomes dependent, since collagen is food and the body's own synthesis is unaffected by eating it; nothing visible arrives, since the changes that exist are instrument-sized and questionnaire-sized, which is why a reader who wants to know what happened to their body keeps a diary of the thing they hoped to change and reads it at twelve weeks, the trials' own reading point. The worked example is the daily habit stated on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% of its reference value plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, below the 2.5 to 15g research band, carrying vitamin C's collagen formation sentence for skin, cartilage and bones and no claim for the collagen. What will happen if you take collagen every day: digestion every morning, a few percent in the skin instruments after twelve weeks if the dose is high enough, modest joint questionnaires after longer, nothing in the mirror without a diary, and 28p a day gone.

What to check on the label