So a 0.25 mg dose = 0.25 ml = 25 units on a U-100 insulin syringe
Proper coping mechanisms keep your body relaxed, making accidental nerve firing less likely without some other cause, like too much caffeine
If you find yourself forgetting things more than usual or struggling to stay sharp, a B12 injection could make a noticeable difference within days
Kiyoshi Okada, Hiroyuki Tanaka, Ko Temporin, Michio Okamoto, Yusuke Kuroda, Hisao Moritomo, Tsuyoshi Murase, Hideki Yoshikawa, Methylcobalamin increases Erk1/2 and Akt activities through the methylation cycle and promotes nerve regeneration in a rat sciatic nerve injury model, Experimental Neurology, Volume 222, Issue 2, April 2010, Pages 191-203 Tanaka, H
Typically, this translates to 0.4 mg