Similar content being viewed by others Introduction For central nervous system (CNS) drugs, the step from in vitro activity to in vivo efficacy depends critically on the ability of the drug to cross the blood-brain barrier (BBB)
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Finally, the results of one randomized controlled trial in 601 patients with common forms of retinitis pigmentosa indicated that supplementation with 400 IU/day of synthetic vitamin E (equivalent to 180 mg/day of RRR --tocopherol) modestly but significantly accelerated the loss of retinal function compared to placebo (123)
Marissa Liza: Yes, there's been a lot of research done, again, only on animals and, but I also wonder why haven't they tested it further on humans, right