Does collagen strengthen muscles?

Whose strength gain is it: the three owners of a strength gain in a training trial, and how much of the collagen trials' gain each can claim

Does collagen strengthen muscles is a question that the trials quoted for it appear to answer yes, because they measured strength and reported gains, and the honest page asks the question those trials were not designed to answer, which is whose strength gain it is, because a strength gain in a training trial has three possible owners and the design of the trial decides how many of them can be told apart. The first owner is the training. Every collagen muscle trial gave both arms twelve weeks of supervised resistance training, three sessions a week, and resistance training is the most powerful strengthening intervention known, especially in the people the trials enrolled: untrained young men and women and older men with sarcopenia gain strength by large margins in the first weeks of a programme, often twenty to forty percent on the trained lifts, through neural adaptation, the nervous system learning to recruit more of the muscle that is already there, to fire its units in better synchrony and to coordinate the movement, long before any muscle fibre has grown measurably, so that the placebo arm in every collagen trial gained most of the strength the collagen arm gained, and the question is only about the difference between the arms, not the gain itself. The second owner is the protein. The difference between the arms in the collagen trials was a modest extra gain in strength and fat-free mass in the collagen group, and the collagen group had received 15g of protein a day that the placebo group had not, because the placebo was silica, an inert powder with no protein in it; the protein and training literature has shown for years that adding protein to a programme in people whose habitual intake has room adds a little to the gains, and older men with sarcopenia, whose intake is often low, are the population in which that little is largest, so that the difference between the arms is the difference that 15g of protein over nothing makes, and whey, egg, soy or an extra portion of meat would be predicted to make it too; the rule of naming the control is applied to each trial on the collagen and muscle page. The third owner would be collagen itself, meaning something collagen does for strength that another protein at the same dose would not, and the honest page states the condition for collagen to claim any share of the gain: a trial comparing collagen with an equal dose of another protein over the same training, finding more strength in the collagen group. No such trial exists, and the trials that did compare collagen with whey, the tracer studies at rest, after exercise and under energy restriction, found collagen not raising muscle protein synthesis where whey did, so that the evidence that could have given collagen a share points the other way. So the strength gain in the collagen trials is owned first by the training, which produced most of it in both arms, second by the 15g of protein, which produced the modest difference between the arms, and by collagen specifically not at all on the evidence that exists, which is not a claim that collagen prevented strength but a statement that nothing in the trials or the tracer studies attributes any strength to it.

The claims that do exist for strength, where collagen's strength evidence actually sits, what a lifter who wants stronger muscles takes and does, and the worked example

The claims that do exist for strength are worth setting beside collagen's absence of one, because the register has examined the question. The one authorised performance claim on the whole supplement aisle belongs to creatine: creatine increases physical performance in successive bursts of short-term, high-intensity exercise, at 3g a day, a sentence earned by decades of trials in which creatine saturated the muscle's phosphocreatine stores and let lifters do a little more work per set, which over a programme compounds into more strength and more muscle; it is the strongest lawful claim a lifter can buy, on the strongest peptide page, and it is not a protein. Protein's claims are for muscle mass, that protein contributes to a growth in muscle mass and to its maintenance, earned by complete proteins and lawful on any protein source by energy, collagen included, which is why a collagen tub may print them and why the tracer studies say the printing is hollow. No strength claim exists for collagen, and none for vitamin C or zinc either, the passengers in a collagen capsule, whose sentences concern collagen formation and immune function rather than force. Where collagen's strength evidence actually sits is not in muscle at all but in connective tissue, and the honest page gives it its due because it is real and it is small: one small randomised trial in young men added specific collagen peptides to around fourteen weeks of supervised resistance training and reported a greater increase in Achilles tendon cross-sectional area than the same training with placebo, a structural proxy for tendon strength moved once, in a manufacturer-funded study that awaits replication, and the pre-loading protocol's synthesis marker rose after gelatin and vitamin C before loading; strength measured tissue by tissue, with bone's one density trial and tendon's one cross-section study as the two positives, is on the collagen strengthen connective tissue page, and a lifter who takes collagen for strength takes it for the tendon, before the loading session, and not for the muscle that pulls on it. What a lifter who wants stronger muscles takes and does follows from the three owners. The training first, because it owns most of the gain: progressive resistance training, two to four sessions a week, with the load rising as strength does, which is the thing that strengthened every arm of every trial. The protein second, because it owns the difference: complete protein at around 1.6 to 2 grams per kilogram across the day, in servings of 25 to 40g that each clear the leucine threshold, from whey, dairy, eggs, meat, fish or a plant blend, which does what the 15g of collagen did in the silica trials and, by the tracer studies, does it better. Creatine third, at 3g a day, for the one lawful performance claim. And collagen nowhere in the strength programme for muscle, beside the tendon session if the lifter's tendons are the concern. The worked example is the protein whose strength evidence is in tendon and not muscle, 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 15g protocol dose and the training trial's dose, carrying vitamin C's collagen formation sentence for cartilage and bones and no muscle or strength claim, since the register permits none and the trials attribute none. Does collagen strengthen muscles: the strength gain in its trials belongs to the training and the protein, collagen's own share is unproven and the tracer studies argue against it, and its one strength result is a tendon's.

What to check on the label