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If your pharmacy provides a 17 mg/mL concentration, the unit math changes entirely

"A low vitamin A status increases the susceptibility to cigarette smoke-induced lung emphysema in C57BL/6J mice." J Physiol Pharmacol (2011) 62(2):175-82

While more clinical research is needed to see if they specifically boost each other's absorption, the anecdotal evidence from athletes and military personnel suggests that this "stack" is a reliable way to support performance without the need for heavy stimulants

Xu et al

Genetically increasing flux through -oxidation in skeletal muscle increases mitochondrial reductive stress and glucose intolerance

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