1.5 g according to the UK National Health Service (NHS) and British Nutrition Foundation (BNF) Increased requirement: 5 g factors which increase an individuals B12 requirement are illness, stress, toxic stress, pregnancy and breastfeeding Dietary Supply or Supplement Requirement
anti-doping scrutiny applies in sport contexts
FTC Affiliate Disclosure : This article contains affiliate links
It should be noted that an NADH-bound Mt DHDPR structure showed a partially closed conformation, with the authors speculating that this unexpected closed structure might represent a snapshot of the equilibrium state between open and closed forms awaiting further substrate binding, and that subsequent substrate binding might induce the fully closed conformation 21
Some people draw HCG and B12 in the same syringe, this may be possible but we cannot comment due to lack of studies
Peters KM, Feber KM and Bennett RC: A prospective, single-blind, randomized crossover trial of sacral vs pudendal nerve stimulation for interstitial cystitis