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Thinning Hair: Nutritional Factors Worth Investigating

By The Gelagen Team · September 2026

Hair thinning has multiple potential causes: genetics, hormonal changes, stress, medication side effects and nutritional deficiencies. A supplement like Gelagen can address the nutritional component, but it is important to identify whether nutrition is actually the issue.

Deficiencies linked to hair thinning

Biotin: true biotin deficiency causes hair loss. It is relatively uncommon but can result from prolonged antibiotic use, excessive raw egg white consumption or genetic biotinidase deficiency.
Iron: the most common nutritional cause of hair loss, particularly in premenopausal women. Gelagen does not contain iron. If you suspect iron deficiency, get tested.
Zinc: deficiency causes hair shedding (telogen effluvium). Our formula provides 2.7mg zinc citrate.
Vitamin D: low levels are associated with alopecia. We provide 10mcg (50% DV).

When a supplement may help

If your hair thinning correlates with poor nutrition, restrictive dieting, recent illness or stress, nutritional supplementation alongside dietary improvement may support recovery. The 13 nutrients in our formula cover the most commonly implicated micronutrients.

When you need a doctor

Sudden or patchy hair loss, hair loss with scalp changes, hair loss after starting new medication, or thinning with other symptoms (fatigue, weight changes, skin changes) all warrant medical evaluation. No supplement replaces a proper diagnosis.

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