does b12 injection cause headache After Shot: Why It Happens & What to Do Vitamin B12 Deficiency in Aging:

I have trouble reaching my upper arm, and when I used to get the Dr to do it in the arm I would have pain for hours that radiated down my arm

But if not enough B12 or other nutrients is to blame, your tongue also may be sore

Sleep disorders such as insomnia, sleep apnea, and restless leg syndrome can disrupt your sleep patterns and leave you feeling tired and unrefreshed, no matter how long you sleep

10.1016/j.celrep.2016.07.027 135 SunW.ZouY.CaiZ.HuangJ.HongX.LiangQ.et al (2022)

In further embodiments, administration of the NNMT inhibitor is in vitro

These injections also include nutrients like methionine, inositol, and choline, which help the body break down fats and use them for energy