I’m probably going to burst a few bubbles with this one. Beginning with telling you the conclusion of this article right off the bat… the supplements that are a specific amino/peptide profile are in most cases a marketing scam.
You have collagen peptides for your skin and joints. BCAAs for recovery. Glutamine for your gut. All with the same promise that it goes to that specific place, and it does that specific job. Unfortuntaly for all of us, that’s not quite how our bodies work.
What the industry is counting on is you not knowing that: your body doesn't absorb protein as protein.
It essentially breaks it apart first. All of it. Then it builds whatever it needs out of the parts, based on what's going on in your body right then. Not based on your intentions for it. Think of it as the same concept as you can’t spot target fat areas on your body with certain exercises… your body decides where it’s going to take the energy from.

Protein is a chain of amino acids. Your body uses 20 of them to build everything from muscle fibers, to enzymes, to the collagen in your tendons. Nine out of these 20 are considered essential, which means you’re not able to create them on your own from other sources like the other 11, so you have to consume them.
What a protein does depends on the order of those amino acids and how the chain folds. Everything from actin and myosin in muscle, collagen in connective tissue, and even the hemoglobin in your blood. Same 20 building blocks, just different sequences, with completely different jobs.
And the fun part is those sequences don’t originate from the food you’re consuming. It comes from your DNA. Your cells read the genetic instructions and assemble each chain one amino acid at a time, pulling from whatever is available in your amino acid pool. This is why eating enough total daily protein is so vital. You’re maintaining that pool of amino acids your body can pull from.

Let’s get a little sciency here: protein hits your stomach and the acid starts unfolding it. Then pepsin (a digestive enzyme) starts cutting the chain into smaller pieces. In the small intestine, enzymes from your pancreas (trypsin, chymotrypsin, and a few others) keep breaking them down, and then enzymes on the gut wall finish the job. What gets absorbed is mainly single amino acids plus some short fragments of two or three amino chains. Most of those fragments get split the rest of the way inside your gut cells before they ever reach your blood.
From there it goes to the liver and out into circulation. This point in the process your body has no idea whether that glycine came from a $50 tub of collagen or a chicken thigh… it's just glycine. It goes into the pool, and your body pulls from it to build whatever it needs, wherever it needs it.
This is why ingesting a certain amino profile is basically a scam. Even EAA’s (essential amino acids) supplements are rarely needed if you’re eating at least a couple sources of a whole food protein. You’re paying extra for something that will not matter once it hits your digestive track.

Collagen is the big one right now. They claim that eating collagen gives you more collagen in your skin, joints, and tendons.
Problem one: it gets broken down like everything else. Eating collagen doesn't send collagen straight to your joints any more than eating a steak will.
Problem two: collagen is a pretty shitty protein. Excuse my French. It's loaded with glycine, proline, and hydroxyproline, very low in leucine, and has basically zero tryptophan. Since it's missing an essential amino acid, it scores a zero on the standard protein quality scale (PDCAAS).
Now, to be fair, because I'd rather be accurate than win the argument. A few of those short collagen fragments (like prolyl-hydroxyproline) do make it into the blood intact. With early research suggesting they might act as signals to the cells that build connective tissue. There's also a well-known study out of Keith Baar's lab where 15 grams of gelatin plus vitamin C, taken about an hour before six minutes of jump rope, roughly doubled a blood marker of collagen synthesis.
Take this with a grain of salt though. It was a specific dose, timed and structured loading, and in a small group of eight people.
Also most of the skin and joint studies you see cited are small, short, and funded by the companies selling the stuff. And even in the Baar work, the tissue adapts because you loaded it… so the collagen is most likely a supporting role.
If you're eating enough total protein, you're already getting plenty of glycine and proline. And if you want to try the Baar protocol for a tendon issue, plain gelatin is basically the same thing at a fraction of the price.

BCAAs are leucine, isoleucine, and valine. Three of the nine essentials. Leucine is the one that flips the switch for muscle protein synthesis.
However, the switch isn't the building material. You can turn the process on all you want, but if you’re looking to build muscle proteins your body needs all nine essential amino acids on hand. So you need to eat whole protein sources… which means you’re probably already getting more than enough of those BCAAs.
Robert Wolfe, who's spent decades studying this, put out a review in 2017 that basically concluded BCAAs on their own can't produce a meaningful anabolic response.
Another 2017 study from Jackman and colleagues gave lifters 5.6 grams of BCAAs after training. Muscle protein synthesis went up about 22% over placebo. That sounds decent until you see it was roughly half the response you get from whey protein carrying the same amount of BCAAs.
And again, if you're eating enough protein, every meal already has BCAAs in it. A 25 gram serving of whey has around 5 to 6 grams of BCAAs and about 2.5 grams of leucine, plus the other six essentials to build with. Chicken, eggs, beef, Greek yogurt, same thing. A BCAA drink is a flavored powder that gives you less of what you're already getting.
The "sip it during training so you don't go catabolic" angle doesn't hold up either. If you ate a meal with protein in the last few hours, you're not in some muscle-wasting emergency halfway through your session, nor post.

Hit your total protein. That's it. There’s your gameplan. For people who train, the research points to around .8-1 grams per pound of bodyweight. The higher ends help with cutting, a continuous stint of hard bouts, or getting older. But regardless going over 1g per pound is probably not going to be doing a whole lot more for you.
Spread it out. Over three to five meals with roughly 25 to 40 grams each should certainly cover your needed amino complex.
Get it from complete sources. Meat, fish, eggs, and dairy are top tier. Whey is also a great source, especially in terms of convenience. Now if you're plant-based, blend your sources or use a decent plant protein blend.

Remember… your body is going to break down into pieces what you give it. Then build it back where it sees fit.

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