Regular check-ins with your healthcare provider can help adjust dosage and ensure safety
Regenerative Medicine, 15(4), 567-579.
[6] [3] [10] A mild deficiency may not cause any discernible symptoms, but moderate deficiency can cause various symptoms, such as feeling tired, lightheadedness, headaches, cold intolerance, pale skin, sore tongue, upset stomach, loss of appetite, hair and skin color changes, numbness or tingling (pins and needles) of the fingers and toes, and tinnitus, and vision, cognitive or psychological problems
I have my pictures
Mayo Clinic Proceedings: Innovations, Quality & Outcomes