Vitamin B12 shots may not be suitable for people with a history of: sensitivity to vitamin B12 Lebers disease, which affects the optic nerve kidney problems hypokalemia (low potassium levels) deficiencies in other nutrients, particularly folic acid and iron Vitamin B12 injections typically begin to work straight away
Maintenance phase with lower frequency
The final stage of healing remodeling begins weeks after the onset of the damage
Since estrogen helps regulate both circulation and temperature, declining levels can contribute to feeling cold all the time in menopause
Here is the honest evidence status up front, because it shapes everything that follows: the human data on this combination is essentially non-existent
[DOI] [PMC free article] [PubMed] [Google Scholar] 136.Gueguen N., Desquiret-Dumas V., Leman G., Chupin S., Baron S., Nivet-Antoine V., Vessires E., Ayer A., Henrion D., Lenaers G., et al