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No mutagenic or carcinogenic effects have been documented

"Patients are injecting substances that have never been adequately tested in humans, based on marketing claims the available evidence simply does not support

Many of the allergy complications that have been published so far have probably not been caused by the B12 molecule itself, but by accompanying substances (trace substances from biosynthesis)

Ongoing investigations continue to examine the peptides mechanisms of action and potential therapeutic applications, though definitive conclusions about its clinical benefits require additional research

(Journal of Physiology and Pharmacology, 2008) showed BPC-157 accelerated healing of anastomotic sites in rat intestinal surgery models, with improved tissue integrity and faster return of normal motility

The protocol page gives the basic cycle answer, while this page covers timeline planning in more detail