The study came very close to meeting the usual standard researchers use for statistical significance (p = 0.0656), but investigators still described the results as a strong positive trend
Vitamin B12 (cobalamin) is found in a wide variety of animal foods, including: Plant foods have no vitamin B12 unless they are added
The Cochrane Database of Systematic Reviews
If your hair loss has other primary causes (such as androgenetic alopecia), correcting B12 deficiency alone may not resolve the issue though it will support overall hair health as part of a comprehensive approach
New, severe, or persistent headache especially with visual changes warrants medical evaluation
This means once you draw from the vial and recap it properly, the remaining solution stays protected not just for a few hours, but for up to 28 days under normal storage conditions