I'm here for two probably contradictory comments.
The first is collagen: I'd love to see Lowe's take on recent peer review which says boosting oral collagen does appear to show signs of improved joint pain and skin resilience. Obviously modulated through how protein deprived you are, but for older people, eating enough protein can be an issue: it's not rapidly absorbed so you need 3 squares a day to get to the higher numbers. Collagen powders and vitamin C (oj) at breakfast might kick start this.
The second contradictory point is that this entire thread makes me want to shout GELL MAN AMNESIA because it's an exercise in otherwise intelligent people who can distinguish between anecdata, their personal experience and some cold hard facts in their core field, but not when it's self injecting unknown chemicals from China bought off-script.
I want to point out your own contradictory comments about absorption and specifically mentioning a typically highly processed food (orange juice), one which has been stripped of its natural fibers and flavors.
That age group (and all others) should be eating real/whole fruit or having the juice fresh (I.e. just juiced). They would be better served getting this advice than creating more anxiety about protein intake.
For the first one, I assume you mean a systematic review, not a peer review? I guess you're talking about this one:
https://pmc.ncbi.nlm.nih.gov/articles/PMC10180699/
It has a Mechanism section which explains that when collagen is digested, one of the products of that is Gly-Pro-Hyp, which is what has the effects. I don't think that conflicts anything in this post?
I assume they're referring to the brief bit in the post that indicates that oral ingestion leads to a breakdown that makes oral supplements of amino acids pointless. They say it very briefly and they don't really outright assert it, it's just a sort of implied aside.
Here is the exact quote:
Every single YouTube video and blog post I have read about peptites is exclusively about injectable supplements.Sweeping statements in biochemistry must be made with caution. It is well known that there are some small peptides that are absorbed following oral administration.
...BPC-157 itself is said to be among this class. As are certain milk tripeptides: https://en.wikipedia.org/wiki/Lactotripeptides
Interestingly enough, those two, as well as Gly-Pro-Hyp, are proline/hydroxyproline-rich, which might suggest that proline-rich small peptides are resistant to degradation in the gut.
Anyway, in general oral proteins and peptides are broken down prior to systemic absorption, but not always...
I'm in agreement. It's the article that made the sweeping statement.
> you need 3 squares a day to get to the higher numbers.
> Collagen powders
In that case if you're eating collagen powder you could be eating just regular protein powder then?