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However, they also have limitations: many are unstable in the gut, so they are often given by injection, and some have limited human data outside of specific indications

And when there are symptomsthings like fatigue, tingling hands, and feet, dizziness, and memory losstheyre often so non-specific that doctors wont always flag B12 deficiency as an obvious cause

Biol Psychiatry 43:511519 Jelovac N, Sikiric P, Rucman R et al (1999a) Pentadecapeptide BPC 157 attenuates disturbances induced by neuroleptics: the effect on catalepsy and gastric ulcers in mice and rats

SOS activates Ras, a small guanosine triphosphatase (GTPase), by exchanging guanosine diphosphate (GDP) for guanosine triphosphate (GTP)