Vitamin B12 deficiency is associated with various symptoms including fatigue, weakness, and neurological issues. While there is some literature that suggests a connection between vitamin B12 deficiency and hair loss, it is not strongly established. Studies have not provided substantial evidence to conclusively link vitamin B12 deficiency directly with hair loss¹². Therefore, while a deficiency might contribute to poor overall hair health, other factors are often involved.

On the other hand, vitamin D plays a more clear role in hair health. Vitamin D is crucial for maintaining the hair cycle and is involved in the growth and maintenance of hair follicles. Deficiency in vitamin D has been associated with various types of hair loss, such as telogen effluvium, alopecia areata, and even more common hair thinning conditions. Low levels of vitamin D can potentially lead to disturbed hair follicle cycling and impaired hair growth³⁴⁵. In your case, a vitamin D level of 19 ng/ml is considered low, and addressing this deficiency could be important for overall hair and bone health.

If you're experiencing hair loss, it could be beneficial to discuss these deficiencies with a healthcare professional who might recommend supplementation or further evaluation to address the issue comprehensively.

Footnotes

1. Zuzanna Sabina Goluch-Koniuszy, "Nutrition of women with hair loss problem during the period of menopause," NCBI, 2016. ↩

2. Hind M. Almohanna, "The Role of Vitamins and Minerals in Hair Loss: A Review," NCBI, 2018. ↩

3. Rosalynn R.Z. Conic, "Vitamin D Status in Scarring and Non-Scarring Alopecia," NCBI, 2024. ↩

4. Sarita Sanke, "Study of serum vitamin D levels in men with premature androgenetic alopecia - PubMed," PubMed, 2020. ↩

5. Kriteeka Saini, "Role of vitamin D in hair loss: A short review," PubMed, 2022. ↩