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We were exploring ways of developing peptides that bind selectively, and we were very successful at that, but then we confronted the problem that our short, 23-residue peptides are not promising therapeutic candidates primarily because they cannot get into cells, Keating says

and fundamentally distinguishes it from other regenerative peptides

That is the core problem with oral peptides, and it is why nearly every clinically proven peptide drug is injected

Melmed S et al

If you're borderline deficient, supplements or food might do the job

BPC-157s mechanisms align remarkably well with Achilles healing requirements