does b12 injection make you sleepy Feeling worse after Injection: Answering concerns Chronic Fatigue: Can B12 Shots

it's general hair-biology context applied to a peptide whose own human evidence is the gap this whole article keeps returning to

A Practical Guide to Vitamin B12 Injectable for Humans If you and your provider decide that vitamin b12 injectable for humans is right for you, knowing what to expect can be helpful

Continuous multi-month use is widely discouraged

How do I know if it's working

A randomized, double-blind, placebo-controlled trial in 191 older adults (75 years) with moderate vitamin B 12 deficiency (serum cobalamin concentrations of 107-210 pmol/L) without anemia provided participants with 1 mg/day of cyanocobalamin for one year (94)

B12 absorption decreases with age due to reduced production of intrinsic factor, a stomach protein needed for absorption