Adults usually get 1000 mcg (1 mg) of vitamin B12 per injection
If receiving cancer treatment, supplementing with Glutathione may cause drug interactions and allow cancer cells to be resistant to chemotherapy drugs, thus decreasing their effectiveness and increasing oxidative stress
Bellanti F, Matteo M, Rollo T, et al
(ii) Construct Pathways: Offer actionable, evidence-based recommendations for individualized dosing timelines, contraceptive strategies, and washout protocols
Because injection and IV infusion bypass the gut, they trade the digestive complaints for a different set: Injection-site reactions redness, soreness, or mild swelling where you inject or where the infusion line sits (the most common effect of any injectable)