What is the recommended dosage for Horsetail Extract?

Hair Loss: 300-900 mg/day standardized extract

What are the side effects of Horsetail Extract?

Potential side effects include: Contains thiaminase (may deplete vitamin B1 with long-term use), Digestive upset, Potential potassium depletion, Not recommended during pregnancy.

Does horsetail extract support hair growth?

Horsetail (Equisetum arvense) is one of the richest plant sources of silica, a mineral that may support collagen synthesis and hair strength. A 2012 study in the Archives of Dermatological Research found that silica derived from horsetail improved hair tensile strength and thickness in women with thinning hair. The evidence is preliminary, and more clinical trials are needed.

Is horsetail extract safe for long-term use?

Horsetail extract is generally considered safe for short-term use. However, it contains thiaminase, an enzyme that can break down vitamin B1 (thiamine), so long-term use without B1 supplementation is not recommended. People with kidney disease, diabetes, or those taking lithium should consult a healthcare provider before using horsetail supplements.

What is the evidence for horsetail extract and hair growth?

Horsetail extract (Equisetum arvense) is believed to support hair health through its high silica content, which may contribute to hair shaft strength and elasticity. However, current evidence for age-related hair thinning is Preliminary (Grade D), based on only 1 study without human participant data. Most claims about horsetail and hair are based on traditional use and in vitro research rather than randomized clinical trials.

What dosage of horsetail extract is used for hair?

Horsetail extract supplements typically range from 300 mg to 900 mg of dried herb equivalent per day. Products standardized for silica content (commonly 5-10% silica) are most frequently used in hair-related contexts. Because human clinical evidence for hair outcomes is very limited (Grade D, 1 study), no evidence-based dosage recommendation can currently be made. Consult a healthcare provider before use.

Does horsetail extract strengthen hair?

Horsetail extract is often marketed for hair strength due to its silica content. Silica is thought to improve hair shaft structure and reduce brittleness. However, the scientific evidence directly measuring hair strength or growth outcomes in humans is very limited — current evidence is Preliminary (Grade D) from 1 study. Until larger human trials confirm these effects, horsetail's role in hair strengthening remains based primarily on traditional use and theoretical mechanism.

Horsetail Extract

herb

Also known as: Equisetum arvense, Shavegrass

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About

Horsetail extract is rich in organic silicon (silica) which may strengthen the hair shaft and improve hair texture. It also contains antioxidant flavonoids. Clinical evidence is limited, with only a few small studies examining its effects on hair growth and quality.

How It Works

Rich in silica (organic silicon) which may strengthen hair shaft; contains antioxidant flavonoids.

Evidence For Conditions

Condition	Grade	Studies	Participants
Age-Related Hair Thinning	D	1	--	View →

Side Effects

Contains thiaminase (may deplete vitamin B1 with long-term use)
Digestive upset
Potential potassium depletion
Not recommended during pregnancy

Drug & Supplement Interactions

Diuretics (additive potassium depletion risk)
Lithium (horsetail's diuretic effect may increase lithium levels)
Antiretroviral medications (may reduce absorption)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Ashwagandha Curcumin Fenugreek Ginseng Green Tea Extract

Quick Facts

Dosage: Hair_Loss: 300-900 mg/day standardized extract
Forms: capsule tablet liquid
Natural Sources: Horsetail plant
Upper Limit: Not established
Best Time: With meals; ensure adequate B1 intake with long-term use

Evidence Summary

Age-Related Hair Thinning D

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.