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Given the spectrum of symptoms associated with long Covid, theres unlikely to be a one-size-fits-all treatment.
Gutgesell RM, Nogueiras R, Tschp MH, et al
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An individual becomes deficient when they are not consuming enough vitamin B12-rich foods or they are unable to absorb sufficient vitamin b12
The time to onset of effect was around 30 minutes for the nasal spray
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