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Published on: 8/18/2026

Which vitamin deficiencies are linked to hair loss in women with PCOS?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Hair loss in women with PCOS (polycystic ovary syndrome) is often linked to nutritional deficiencies, particularly low levels of Vitamin D and iron. These nutrients play a critical role in hair follicle health and growth cycles. Other common deficiencies include zinc, biotin, and B vitamins, all of which can worsen thinning hair when PCOS-related hormonal imbalances are already at play.

Addressing these deficiencies through bloodwork, dietary changes, and targeted supplementation—alongside managing PCOS itself—can help restore hair health over time.

If you're experiencing hair loss and suspect PCOS or a nutritional imbalance may be the cause, don't guess your way through it. A free, instant, online symptom check can help you quickly identify possible causes based on your unique symptoms and guide you toward the right next steps—whether that's specific lab tests, a specialist referral, or lifestyle adjustments. Understanding what's driving your symptoms is the first step to effective treatment.

Reviewed for medical accuracy: 07/14/2026

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Explanation

Hair loss in women with PCOS can be linked to certain vitamin and mineral deficiencies. Vitamin D is important for hair health, and having low levels can contribute to hair loss. Iron, which is stored in the body as ferritin, is another crucial mineral. Low ferritin levels can lead to hair thinning or loss.

Key Points:

  1. Vitamin D Deficiency: This vitamin helps with hair growth, and not having enough can cause hair to fall out.
  2. Iron Deficiency: Iron is stored in the body as ferritin, and low ferritin levels can result in hair loss.

These deficiencies can be common in women with PCOS, and addressing them might help improve hair health. If you're experiencing hair loss or other concerning symptoms, you can check your symptoms with Ubie's free AI-powered tool to better understand what might be happening and determine if you should consult with a healthcare provider for proper testing and management.

(References)

  • Almohanna HM, Ahmed AA, Tsatalis JP, & Tosti A. (2019). The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatology and therapy, 30547302.

  • Rasheed H, Mahgoub D, Hegazy R, El-Komy M, Abdel Hay R, Hamid MA, & Hamdy E. (2013). Serum ferritin and vitamin d in female hair loss. Skin pharmacology and physiology, 23428658.

  • Cheung EJ, Sink JR, & English Iii JC. (2016). Vitamin and Mineral Deficiencies in Patients With Telogen .... Journal of drugs in dermatology : JDD, 27741341.

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