Horsetail Extract

Overview

Horsetail extract is made from the green stems of Equisetum arvense, a primitive, fern-like plant that has been around since the time of the dinosaurs. The plant is notable for its high natural silica content — among the highest of any common plant — along with flavonoids, saponins, and trace minerals.

Forms in DIY supply:

• Glycerin extract: water-soluble, the most common DIY form.
• Dried plant material: for soap, infusions, and herbal extractions.
• Concentrated extract (standardized to silica content): used at low percentages.

Shelf life: 1-2 years for glycerin extracts stored cool and dark.

The silica content is what makes horsetail interesting. Silica is involved in collagen formation, connective tissue strength, and keratin production — which is why horsetail keeps appearing in hair, nail, and firming skincare formulas. The actual topical delivery is limited (silica is a large molecule and absorbs poorly through skin), but the supporting effect is real for skin texture and surface conditioning.

What it does in a formula

The flavonoids (mostly quercetin glycosides) provide antioxidant action. The saponins contribute mild astringent and cleansing effects. The silica content supports surface skin and hair structure, contributing to apparent firmness and shine.

For hair the silica is especially valuable. Topical horsetail extract in hair care has documented effects on hair strength, shine, and breakage resistance — likely through the surface mineral interaction rather than deep penetration.

In a formula horsetail acts as a gentle supportive active for hair, nail, and firming skincare. It pairs well with collagen-supportive ingredients, peptides, and other mineral actives.

How to use

Add to the water phase. Tolerates heat-and-hold to 80 C.

Usage rates by product type (glycerin extract):

• Hair masks and conditioners (strengthening): 2-5%
• Nail strengthening oils and creams: 2-5%
• Firming face creams: 1-3%
• Body lotions for mature skin: 1-3%
• Scalp serums: 2-5%
• Bath salts and body soaks: use dried plant material in muslin bag

Best for / Worst for

Best for: hair strengthening formulas, nail care products, firming and mature skincare, scalp serums, “mineral-rich” or “plant silica” positioning, formulas pairing horsetail with peptides or collagen-supportive actives.

Worst for: oil-only formulas (water-soluble), formulas where you want a strong visible result from one ingredient (horsetail is supportive, not heroic), pregnancy formulations (some traditional caution).

Common pitfalls

Expecting “wow” results from silica alone. Topical silica delivery is limited. Horsetail extract contributes to the marketing story and the supporting chemistry, but it is not a one-ingredient solution. Pair with peptides or other actives.

Pregnancy caution. Some traditional sources caution against horsetail in pregnancy. If your formula targets pregnant customers, check current guidance or substitute.

Quality variability. Wild-harvested horsetail can be contaminated with related Equisetum species that contain higher levels of less desirable compounds. Buy from suppliers who specify Equisetum arvense specifically and provide a COA.

Substitutes

• Bamboo extract — another high-silica plant, similar positioning.
• Nettle extract — different chemistry, similar hair-strengthening tradition.
• Centella asiatica extract — different chemistry, similar firming role.
• Concentrated silica derivatives — for direct silica delivery, different ingredient.