I had SEVERE Vitamin D Deficiency (MY LEVELS WHERE 5) I’m a male and my doctor thought this could be contributing to my diffuse thinning. I started therapy in three months ago and got my levels up to 20. If the loss was caused by VitD than how long does it usually take to cycle the hair back to normal growth.
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I do not have experience with treating a Vitamin D deficiency and the recovery from it. Assuming that you do not have male patterned baldness on top of it, I would imagine that the hair should recover (I used “should” because it is logical that it would) in the normal cycling phase, which may take 3 years as the existing hairs undergo their anagen (about 3 years), catagen (days to weeks) and telogen phases (3 months). To learn more about the hair growth cycles, see here.
I am curious how you became deficient in Vitamin D, but pleased to hear you’re undergoing appropriate treatment.