Here's the key nuance: these side effects can occur even on a small dose
Reason #1 - Slow Down Aging and Promote Regeneration Chronological aging is inevitable, but biological aging is malleable
When oxidative stress is high, hormone signaling can become imbalanced, and the environment needed for fertilization, implantation, and early pregnancy becomes less stable
There are numerous other ways to lose weight effectively
B12 injections tend to be most useful for: Patients on GLP-1 medications (semaglutide, tirzepatide) who feel fatigue in early weeks Patients with low energy, brain fog, or mood symptoms Vegetarians or vegans (plant foods don't contain B12) Adults over 50 (B12 absorption drops with age) Patients who've had digestive surgeries (bariatric, gallbladder) that affect absorption They're generally safe B12 is water-soluble, so your body excretes what it doesn't use