Thinning hair: Vitamin D deficiency can contribute to hair thinning. Some people may notice that their individual strands have become finer and more fragile. As the nutrient plays a role in promoting the growth of new hair follicles, its scarcity can lead to a reduction in hair thickness over time.
Overall, additional studies are required to determine vitamin D supplementation efficacy, both among hair loss patients depicting deficiency and those who do not. Assessing the serum vitamin D level in patients presenting with hair loss may be beneficial but the evidence for vitamin D supplementation is supportive of use with minoxidil.According to Toronto-based family medicine practitioner Dr. Sheila Wijayasinghe, nutritional deficiencies are one of the four main causes of nail problems like peeling or cracking. A lack of fat-soluble vitamins like vitamin D or A is a primary reason. Not only does vitamin D itself appear to play a role in maintaining nail integrity, theVitamin D and its receptor are intimately involved in hair growth. A deficiency in this nutrient can lead to hair loss ( Journal of Cosmetic Dermatology, Nov. 2021 ). We could, however, find no research on the effects of excess vitamin D on hair loss. On the other hand, excess vitamin A is known to cause hair loss.