Can DHEA cause hair loss in a woman with primary adrenal insufficiency?

DHEA and Hair Loss in Women with Primary Adrenal Insufficiency

Yes, DHEA can cause hair-related side effects in women with primary adrenal insufficiency, including scalp itching and changes in hair status, though these are generally mild androgenic effects rather than frank hair loss.

Understanding the Risk

The 2016 Endocrine Society Clinical Practice Guideline on primary adrenal insufficiency acknowledges that DHEA replacement can produce androgenic side effects in women 1. These side effects are explicitly mentioned as:

• Increased sebum production
• Facial acne
• Changes in hair status

Research studies provide more specific data on hair-related complaints:

• In a 2003 randomized trial, 89% of patients receiving DHEA experienced side effects, with scalp itching being specifically reported 2
• A 2011 study documented 60% of patients reporting seborrheic side effects during DHEA treatment 3
• A 2001 review noted that androgenic side effects on skin and hair appear "moderate and acceptable" 4

The Mechanism

DHEA is converted to more potent androgens (testosterone and dihydrotestosterone) in peripheral tissues 1. While absolute androgen levels typically remain within normal range, the androgenic activity can manifest as:

• Scalp itching (common)
• Increased sebum production (common)
• Changes in hair texture or growth patterns (less common)

Importantly, one study found that female pattern hair loss may be triggered by a low estrogen-to-androgen ratio rather than absolute androgen excess 5. This suggests that DHEA supplementation, which increases androgens without proportionally increasing estrogens, could theoretically worsen this ratio in susceptible women.

Clinical Decision-Making Algorithm

When considering DHEA in women with PAI:

1. Only prescribe if specific symptoms are present despite optimized glucocorticoid/mineralocorticoid replacement:

   • Low libido
   • Depressive symptoms
   • Low energy levels 1

2. Start with 25-50 mg oral dose in the morning 1

3. Monitor for androgenic side effects at each visit, specifically asking about:

   • Scalp itching
   • Changes in hair texture or growth
   • Increased facial/body hair
   • Acne
   • Increased sweat odor

4. Discontinue after 6 months if no sustained benefit 1

5. Monitor morning DHEAS levels (before daily dose) aiming for mid-normal range 1

Important Caveats

The evidence for DHEA benefit is weak. A systematic review and meta-analysis found no substantial clinical benefit to support routine DHEA use in women with adrenal insufficiency 1. The 2014 Endocrine Society guideline on androgen therapy concluded there are insufficient data to support routine use of DHEA in women with adrenal insufficiency 6.

Side effects are common but usually mild. While hair-related complaints occur, they rarely constitute true androgenic alopecia. Most commonly reported are scalp itching and increased sebum production rather than hair loss per se 2, 3.

Individual susceptibility varies. Women with genetic predisposition to androgenic alopecia or those with already unfavorable estrogen-to-androgen ratios may be at higher risk 5.

Practical Recommendation

If a woman with PAI develops scalp itching, increased hair shedding, or other androgenic symptoms on DHEA, reduce the dose to 25 mg daily or discontinue the medication entirely. Given the weak evidence for benefit and high frequency of side effects (60-89% in studies), the threshold for discontinuation should be low. The guideline explicitly states DHEA should be stopped if no sustained benefit is seen after 6 months 1.

Do not prescribe DHEA for routine use—reserve it only for women with specific symptoms of androgen deficiency who have failed optimization of standard replacement therapy 1, 6.