Other side effects from too much niacin include: Itchy skin Rapid heartbeat Gout Nausea Vomiting Diarrhea Liver damage Vitamin B12 or Cobalmin Reports suggest that vitamin B12 can cause an allergic reaction, with symptoms such as: Itchy skin Hives Skin rash Tongue swelling Difficulty breathing Bloating Painful stomach Vitamin B7 or Biotin Another B vitamin that may cause an allergic reaction is vitamin B7
REGEN is not an approved drug, medicine, dietary supplement, or therapeutic agent
it reportedly heals ulcers, regenerates nerves, aids muscle and tendon repair, counters neurodegenerative diseases, and protects organs from injuries
2017;14(3):e1002254
However, a study that included 97 women with high-frequency episodic migraine or chronic migraine and 146 healthy matched women found, although vitamin D levels were lower in migraine patients, they were not correlated with migraine frequency or with levels of calcitonin gene-related peptide (CGRP), measured on a non-migraine day, suggesting the relationship may not be causal (Haro 2025)
