First, you want to thoroughly wash your hands with soap and water for at least 20 seconds
Identifying and addressing the B12 deficiency can help reverse this type of hair loss
Standard AOD-9604 Dosing Protocol Subcutaneous Injection Dosing: Beginner: 250 mcg per dose, once daily Intermediate: 300-400 mcg per dose, once daily or divided into two doses Advanced: 500 mcg per dose, once daily or 250 mcg twice daily Oral Administration Dosing (if using oral formulation): Standard: 1-2 mg per dose, once daily on empty stomach Higher protocols: Up to 5-10 mg daily, as studied in clinical trials Frequency: Once daily (morning preferred) or twice daily (morning and early afternoon) Timing: Best administered on an empty stomach, typically upon waking or before exercise Cycle Length: 12-16 weeks for initial assessment, with potential for longer protocols based on response Off Cycle: 4-8 weeks between cycles, though not strictly required based on current research Note: Start at the lower end of the dosing range to assess individual tolerance

The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12: a review of literature. European Journal of Clinical Nutrition 68(5) (2014): 541548
It depends on your condition
The manufacturing process for vitamin b1, b6, and b12 involves series of steps including drug development, synthesis, formulation, and filtration etc