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Clinical studies show that regular swallowed tablets and sublingual (under the tongue) tablets are equally effective, as both rely on passive diffusion once they reach the digestive tract [11]
Regulatory Peptides , 160 (1-3), 2632
What do vitamin B12 injections do for you
Because chronic fatigue often involves overlapping nutrient deficiencies and poor gut absorption, IV infusions offer a reliable path to consistent B12 and micronutrient delivery
It remains a research chemical, and its use in humans is primarily limited to clinical studies, though it is not universally banned
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