Other effects require reporting to a medical team as soon as possible, including: An allergic reaction, including rashes, itching, hives, and a swollen face, tongue, throat, or lips High blood sugar symptoms Other liver damage symptoms, including pain in the upper-right abdomen, appetite loss, dark yellow urine, a yellow tint in the skin or eyes known as jaundice, and feeling unusually weak or tired Tingly, numb, or painful feet Following a balanced diet means that most people are unlikely to develop a B vitamin deficiency
Many peptides are not FDA-approved for human use outside of limited clinical contexts
Finally, due to the nature of cross-sectional study designs, we cannot interpret the causality of the observed association between VitB12 and insomnia
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