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At iThrive, we always recommend deeper testing first through Book a Root Cause Analysis when any of you stated unexplained B12 deficiency, ongoing fatigue, and digestive issues despite taking supplements
TB4 has been shown to promote the development of new tissue fibers, blood cell and new blood vessel production
In turn, organic dietary species of Se such as selenoamino acids (SeMet, Se-methylselenocysteine, and to the lesser extent Sec) seem to be capable of entering the brain via aminoacid transporters and, possibly, other routes
However, most studies report that even with regular use, glutathione has minimal side effects
Most importantly, it has not been tested in humans, so while the findings are intriguing, there is no evidence yet that it actually works