b12 subcutaneous injection sites Injections at Home - Safety Guide for Self-Administration Best Vitamin B12 Injection Site:
Description
What ingredients in B12 supplements might cause digestive upset

Adding 2ml creates 1mg/ml (1000mcg/ml)
Vitamin B12 is primarily found in animal products such as meat, fish, eggs, and dairy

In addition, in research on aging-related muscle atrophy (sarcopenia), it can promote muscle cell proliferation and differentiation, reduce muscle cell apoptosis, and enhance muscle strength and endurance by activating the SIRT1 signaling pathway
PubMed Chang CH, et al
