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18 year old male with hair thinning issues.

I am 18 years old and i have noticed that the hair on my crown is a bit thinner than it used to be. There are many thick hairs on my crown but there are a lot of thin brittle hairs throughout the crown. My temples haven't receded. Also I have a very very low vitamin D deficiency and I was wondering if that is related to the hair thinning I have been seeing.

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