Horsetail

Traditionally, horsetail has been used primarily to support hair, skin, nail, and connective tissue health, especially when strengthening brittle nails or thinning hair. It is commonly prepared as a tea, tincture, capsule, or infused hair rinse.

Common Name: Horsetail
Latin Name: Equisetum arvense
Alternate Names: Shavegrass

• Parts used: aerial stem (herb)
• Primary properties: astringent, diuretic, nutritive
• Common preparations: tea, tincture, capsule, hair rinse
• Best known for: strengthening hair, skin, and nails

Health Conditions Horsetail Helps With

• Brittle Nails — Horsetail’s mineral-rich, nutritive quality has traditionally made it a go-to herb for supporting stronger, less brittle nails.
• Thinning Hair — Traditionally used, both internally and as a rinse, to support hair strength and overall scalp health.
• Mild Fluid Retention — Its diuretic quality has traditionally been used to support the body’s normal fluid balance.
• Connective Tissue Support — Traditionally associated with supporting healthy skin, bone, and connective tissue due to its mineral content.
• Urinary Tract Discomfort — Historically included in traditional formulas aimed at supporting urinary tract comfort.

Compounds

• Silica (silicic acid) — the compound most associated with horsetail’s traditional reputation for supporting hair, nail, and connective tissue strength.
• Flavonoids — generally understood to contribute antioxidant activity alongside horsetail’s other traditional benefits.
• Saponins — plant compounds thought to contribute to horsetail’s traditional diuretic reputation.
• Minerals (including potassium) — support horsetail’s overall traditional nutritive and fluid-balance use.

Properties

• Astringent — helps tone tissue, tied to horsetail’s traditional use for skin and connective tissue support.
• Diuretic — traditionally used to support the body’s normal fluid balance.
• Nutritive — valued as a mineral-rich herb, particularly for its silica content.
• Mild anti-inflammatory — traditionally associated with supporting general tissue comfort.

Recipes Using Horsetail

• Horsetail Tea — a traditional infusion made from the dried aerial stem, commonly used for hair, skin, and nail support.
• Horsetail Hair Rinse — a strong, cooled infusion poured over the hair after washing, traditionally used to support hair strength and shine.
• Horsetail Tincture — a concentrated liquid extract taken as part of a daily mineral-support routine.

Products Featuring Horsetail

• Dried Herb (cut & sifted) — used for tea, hair rinses, or homemade tincture-making.
• Standardized Extract Capsules — chosen for consistent dosing as part of a daily hair, skin, and nail routine.
• Tincture — offers a concentrated, adjustable option for internal use.

Synergies

• Nettle — traditionally paired with horsetail for combined mineral and connective tissue support.
• Oat Straw — combined for a similarly mineral-rich, nutritive quality alongside horsetail’s silica content.
• Comfrey Leaf — paired in some traditional external preparations for skin and tissue support.
• Dandelion Leaf — added for complementary mineral content and gentle diuretic support.

Safety & Precautions

Horsetail should be used with some caution, as it contains an enzyme (thiaminase) that can deplete vitamin B1 (thiamine) with prolonged, high-dose use; using a properly processed, thiaminase-free preparation and avoiding continuous long-term use helps address this concern. It’s traditionally used in defined courses rather than indefinitely for this reason. Pregnant and breastfeeding individuals should consult a healthcare provider before use, as safety data is limited. Because of its diuretic quality, those on diuretic medications or with kidney conditions should consult a healthcare provider before use, to avoid excessive fluid or mineral loss. Horsetail may also affect the absorption of certain medications, so it’s often recommended to take it a couple of hours apart from prescription drugs. Horsetail is toxic to horses and livestock in large quantities and is not recommended for pets without veterinary guidance.

Q&A

Does horsetail taste bitter?

No, horsetail has a mild, slightly earthy, grassy flavor rather than a bitter one, making it fairly easy to drink as tea. It’s not an especially flavorful herb on its own, so it’s often combined with other herbs for taste.

Pairing horsetail with a milder or more aromatic herb like nettle or mint can help round out its flavor.

Can horsetail be used daily?

Horsetail is traditionally used for defined periods, often a few weeks at a time, rather than as an indefinite everyday herb, largely due to concerns about its effect on thiamine levels with prolonged use. Many traditional practices favor cycling its use with breaks in between.

For hair rinses used externally, more regular use is generally considered lower risk than continuous internal daily dosing.

Is horsetail good for hair growth?

Horsetail has a long traditional reputation for supporting hair strength and health, largely attributed to its silica and mineral content, and it’s commonly used both internally as tea or capsules and externally as a hair rinse. Traditional use frames it as a supportive, strengthening herb rather than a guaranteed growth solution.

Many people incorporate horsetail into a broader hair-care routine alongside other mineral-rich herbs like nettle for a more complete traditional approach.

Is fresh or dried horsetail better?

Dried horsetail is the standard form used for tea, tincture-making, and hair rinses, since it’s more widely available and stores well. Fresh horsetail isn’t typically used medicinally in the same way, partly because identification matters (some related species can be more toxic), so dried, properly sourced horsetail is generally the safer choice.

If foraging fresh horsetail yourself, correct plant identification is especially important given the existence of look-alike species.

How should horsetail be stored?

Dried horsetail should be stored in an airtight container away from light, heat, and moisture, where it typically retains potency for about a year. Whole or cut herb holds up better in storage than powdered forms.

Horsetail tincture stores well for several years when kept in a dark glass bottle in a cool location away from direct light.

References

• Plants of the World Online: Equisetum arvense
• PubMed: Scientific Literature on Equisetum arvense
• National Library of Medicine: Chemical Constituents from Equisetum arvense
• Wikipedia: Equisetum arvense
• ScienceDirect Topics: Equisetum arvense Research
• North Carolina State Extension Plant Toolbox: Equisetum arvense
• National Library of Medicine: Silica and Mineral Content Research