Hormonal changes, certain medications (including hormonal birth control), stress, or certain health conditions can sometimes result in lighter or infrequent bleeding (6,16-19)
However, vitamin B12 may give you the appearance of fuller and thicker hair because the increase in oxygen to hair follicles can help stimulate the replacement of lost strands
This risk appears mostly in cases of chronic, unsupervised oral megadosing
The decrease in activity causes fewer amounts of hormones and peptides to be produced by the thymus
But as with any injection, a few mild effects are possible: Temporary redness or swelling at the injection site Mild nausea or digestive shifts Headache or light dizziness A brief boost in energy or restlessness (common if you're sensitive to B12) Bright yellow or orange urinetotally normal, just your body clearing excess B12 If anything feels off or persists, check in with your provider
It is the industry-standard preservative for this application
