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For recovery enhancement, performance optimisation, or longevity goals in healthy people, until a randomised, placebo-controlled trial in a defined population with an objective primary endpoint and pharmacovigilance over a clinically meaningful duration produces data we do not currently have, we just don't have good evidence of benefit, let alone safety

The research discussed involves primarily animal studies, and human clinical data remains limited

Comparative Bioavailability Table This bioavailability difference means that a 250mcg nasal spray dose might deliver similar systemic exposure to a 500mcg oral dosean important consideration for both efficacy and cost-effectiveness

You may feel the noticeable effects for about one to two weeks, but traces of the vitamin can linger longer because your liver stores some of it

The problem is the gap between preclinical data and clinical evidence