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BPC157 also appears in studies to play a key role in protecting the gastrointestinal lining, and gut-wall integrity, with research into gutbrain interactions, making it of particular interest in clinical trials related to managing leaky gut, Crohns disease, and NSAID-induced ulcers

Effects of acute and chronic exercise on immunological parameters in the elderly aged: can physical activity counteract the effects of aging

And so that's where I think the success of it is

But they can conduct randomized clinical trials that administer GH or a placebo to healthy young athletes and then measure body composition, strength, and exercise capacity in the lab