glutathione supplement 1000mg PurePremium Reduced per Serving – 98% Purity – L-Glutathione 500mg per Capsule – Antioxidant Supplement for Liver Detox, Skin, Brain & Immune Support – 45-Day Supply : Everything Else Reduced Glutathione Supplement, 1000mg Pure

And remember, you cant overdose on B12

Laurberg P, Cerqueira C, Ovesen L, Rasmussen LB, Perrild H, Andersen S et al (2010) Iodine intake as a determinant of thyroid disorders in populations

Not Approved Brands tested in this Review are BIOptimizers, Bluebonnet, BulkSupplements.com, Doctor's Best, Garden of Life, GNC, InnovixLabs, Jigsaw Health, Life Extension, Natural Vitality, Nature Made, NOW, NutriCology, Pure Encapsulations, and Swanson Triple Magnesium Complex

GPs cannot rely on symptoms or macrocytosis to determine which patient needs testing for B12 deficiency, nor can these clinical parameters be used for follow-up when results are low or borderline