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"Homocysteine and vitamin B12 status relate to bone turnover markers, broadband ultrasound attenuation, and fractures in healthy elderly people"

CNBC spoke to a few individuals, some participating in Pfizers trial and others in Modernas trial who said much the same thing: the side effects were intense and included a high fever body aches, bad headaches and exhaustion in addition to the more common side effects, but were worth it for protection from Covid-19

(14) While some studies suggest B12 could be beneficial in treating insomnia and sleep disorders, other studies remain largely inconclusive or link high-dose B12 to sleep impairment and short sleep duration - the opposite of what we want

If you bought it from a UK supplier then it's much more likely that your they have had them stored at room temperature for days/weeks/months

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