Steven Bartlett with Dr. Alex Tatem
A peptide that helps a rat's injured tendon heal has not yet proved the same benefit in people. That gap matters when laboratory promise becomes a treatment claim.
He defines peptides as short amino acid sequences that function like precision keys for specific cellular receptors, causing fewer broad side effects than traditional small-molecule drugs.
Tatem describes animal findings of BPC-157 promoting blood vessel growth near injury and healing severed rat Achilles tendons; his human observations concern apparent tolerability, not healing efficacy.
One patient he describes had obesity and insulin resistance, and his sperm count improved tenfold into the normal range after he lost 100 pounds while taking tirzepatide, exercising, and improving his diet, suggesting metabolic improvement may benefit some cases of male infertility.