This is nonsensical. It's highly digestible protein, probably less than 1% makes it through the small intestine.
Probably don't get enough through diet:
https://pubmed.ncbi.nlm.nih.gov/20093739/
"Here, we test this prediction by comparing all reported fluxes for the production and consumption of glycine in a human adult. Detailed assessment of all possible sources of glycine shows that synthesis from serine accounts for more than 85% of the total, and that the amount of glycine available from synthesis, about 3 g/day, together with that available from the diet, in the range 1.5-3.0 g/day, may fall significantly short of the amount needed for all metabolic uses, including collagen synthesis by about 10 g per day for a 70 kg human. This result supports earlier suggestions in the literature that glycine is a semi-essential amino acid and that it should be taken as a nutritional supplement to guarantee a healthy metabolism."
That's for glycine and not collagen, but glycine comprises a full third of the amino acids in collagen so it's a reasonable proxy. Most food sources are relatively low in glycine and nothing but tough meat and bones contains meaningful amounts of collagen.
Supplements that aren't overpriced run about $0.30/10 grams. Equivalent amounts through food are going to run you 10x that and be a lot less convenient.
Not so for hydrolyzed peptides, which is what most studies use. If nothing else, hydrolyzed peptides are more convenient since they dissolve in cold liquids and don't gel.
This is going to be far more expensive and less convenient than powdered collagen peptides.
The screenshots below are Consensus' summary of the topic. I limited the query to placebo controlled RCTs in humans. The mechanisms are still being elucidated (though are likely related to the di- and tripeptides that collagen breaks down into and enter the bloodstream intact, which has been confirmed through radiolabeling studies, acting as signaling molecules similar to how leucine is the signaling molecule for muscle protein synthesis, or maybe just glycine alone) but the outcome data is pretty strong.


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