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She is describing the symptoms I experienced for over a year before I was diagnosed with myelopathy of the spinal cord due to severe B12 deficiency

However, it does come in higher concentrations, so always be aware of what you have if giving at home

Higher purity means more of the active compounds in each serving that give glutathione its powerful properties

Larkin PB, Sathyasaikumar KV, Notarangelo FM, Funakoshi H, Nakamura T, Schwarcz R, Muchowski PJ

So if a healthy person stops taking in vitamin B12, it often takes a few years before the body runs out of it and develops symptoms of vitamin B12 deficiency

(n.d.-e)