Even with B12 in the diet, absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age and with certain medications
In my belly I'm less prone to getting bumps, but the injection site hurts at the time of injection (sometimes only slightly, sometimes so much I have to withdraw) and often through to the next day
Chemical Society Reviews
Studies involving approximately 900 participants consistently demonstrated fat loss without changes in IGF-1, preserved glucose homeostasis despite fat reduction, absence of anabolic tissue growth effects, and safety profile comparable to placebo
Others may have minute quantities of B12 derived from bacteria
When these crucial nutrients fall below optimal levels, your hair follicles simply cannot function properly, leading to weakened strands, slower growth cycles, and noticeable hair loss