b12 injection on arm Injections at Home - Safety Guide for Self-Administration Best Vitamin B12 Injection Sites:

This is the protocol that typically yields the best balance of results and side effects

A cross-sectional study of 700 community-living, physically disabled women over the age of 65 found that vitamin B 12 -deficient women were twice as likely to be severely depressed as non-deficient women (97)

While direct cortisol measurements were not specifically reported in the published safety trials, the comprehensive metabolic monitoring across 900+ participants showed no clinically significant hormonal changes, and the mechanism of action provides no pathway for cortisol stimulation

You can read more in our guide to bacteriostatic water for peptides

Also most of them look awful