does sublingual b12 work as well as injections Vitamin vs tablets: which is better for you? Vitamin B12 Injections - Vie
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doi: 10.1038/s41586-022-05194-y 40 LiuQYinXLanguinoLRAltieriDC

Am J Physiol Endocrinol Metab

Each of these side effects is temporary and improve gradually over time

doi: 10.1159/000369731
