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Researchers select format based on route of administration requirements and whether the protocol calls for fixed or variable dosing across experimental arms
Unlike oral supplements, which require daily use and may result in inconsistent absorption, injections deliver a high concentration of the vitamin directly into your bloodstream, allowing for longer-lasting benefits and fewer treatments
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Chang D, Kong F, Jiang W, Li F, Zhang C, Ding H, Kang Y, Li W, Huang C, Zhou X, Zhang X, Jiao H, Kang Y, Shang X, Zhang B (2023) Effects of L-carnitine administration on sperm and sex hormone levels in a male wistar rat reproductive system injury model in a high-altitude hypobaric hypoxic environment