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Vendors who do not disclose their synthesis source make independent verification harder
Chen L, Kadoya K, Endo T, Iwasaki N, Terkawi MA
B12 plays an essential role in neurological health as well as supporting red blood cell production and immune regulation
Lv, S., Cai, H., Xu, Y., Dai, J., Rong, X., & Zheng, L
Side effects are uncommon and usually mild, like brief soreness at the injection site
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