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While this sounds painful, it actually is relatively painless for most people
"Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms", Integrative Medicine: A Clinician's Journal (Encinitas)
If youre deficient in this nutrient, you may experience mild flushing or restlessness due to the buildup of sulfites and sulfite byproducts
doi: 10.12890/2020_001646 53 PolonikovA
Selenoproteins in nervous system development and function
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