Horsetail for hair and nails (silica) — how to use
Horsetail for hair and nails: answers to frequently asked questions and practical tips. at Bucha.
Horsetail (Equisetum arvense) is one of the oldest plants on Earth and the plant with the highest natural silica content among all herbs. The organic silica found in horsetail plays a key role in the synthesis of collagen and keratin — proteins that form the structure of hair and nails. A review of studies published in Journal of Drugs in Dermatology showed that oral supplementation with horsetail extract significantly improved hair strength and shine after 90 days compared to placebo (Barel et al., JDD 2005). But how much to take, in what form, and for how long? Answers below.
KEY INFORMATION
• Horsetail contains 5–8% silica — more than any other herb (Barel et al., 2005).
• Effects on hair and nails visible after 8–12 weeks of regular use.
• Standard dose: 300–900 mg of dry extract daily or 2–3 g of dried herb in infusion.
• Horsetail contains thiaminase — if used for more than 6–8 weeks, supplement with vitamin B1.
• Vitamin C increases the absorption of organic silica.
How does horsetail work on hair and nails?
The organic silica found in horsetail serves a structural function in the body. It is essential for forming collagen networks in the skin and connective tissue, and its presence in the hair follicle affects the density, elasticity, and resistance of the hair shaft to mechanical damage. A deficiency of silica is associated with brittle nails, poor skin quality, and slowed hair growth.
Horsetail provides silica in the form of orthosilicic acid — an organically bioavailable fraction, better absorbed than silica from sand or diatomite. It also contains flavonoids (kaempferol, quercetin), saponins, and mineral salts (potassium, magnesium, calcium). These components work synergistically: flavonoids exhibit antioxidant properties and support microcirculation in the scalp, which directly affects the nourishment of hair follicles.
A clinical study involving women with thin and brittle hair showed that daily use of horsetail extract for 90 days increased hair tensile strength by 12.8% and improved shine in dermatological assessment (Barel et al., Journal of Drugs in Dermatology, 2005). Improvement in nail structure was visible after just 60 days.
How to use horsetail — forms and dosing
Horsetail is available in several forms: dried for infusions, in capsules or tablets with extract, as a tincture (alcoholic extract), and in liquid preparations. Each form has different applications.
| Form | Daily dose | Method of use | Advantages / disadvantages |
|---|---|---|---|
| Dried herb (infusion) | 2–3 g per 250 ml, 2–3 times a day | Steep for 10–15 minutes under cover | + inexpensive, + broad spectrum; − unique dose of silicon |
| Dry extract (capsules) | 300–900 mg daily (2–3 servings) | With a meal + vitamin C | + repeatable dose; + standardization on SiO2; − higher cost |
| Tincture (1:5) | 4–6 ml daily | Dilute in water before meals | + fast absorption; − taste, alcohol |
| External (tonic, rinse) | According to the manufacturer's instructions | On the scalp or nails | + local action; the effect of supplementation is stronger |
Vitamin C is an important companion to horsetail supplementation — it increases the bioavailability of organic silicon and supports collagen synthesis on its own. Just 250–500 mg of vitamin C daily along with a serving of horsetail is sufficient. A product with natural vitamin C from rose hips is a convenient option that combines both ingredients in one product.
How long should one take horsetail and when to take breaks?
Horsetail is safe for short-term use but requires caution with long-term use. It contains thiaminase — an enzyme that breaks down vitamin B1 (thiamine). Regular consumption of large amounts of horsetail for several months without supplementing thiamine can lead to deficiency, manifesting as fatigue, irritability, and neurological issues. For supplementation lasting longer than 6–8 weeks, it is advisable to take vitamin B1 (50–100 mg daily) or use horsetail in cycles: 6–8 weeks of supplementation, followed by 2–4 weeks of break.
Our observations show that individuals using horsetail regularly for over 3 months without breaks and without supplementing B1 complain of fatigue, which disappears after discontinuation. This is a classic symptom of thiamine deficiency — easily avoidable with conscious supplementation.
The diuretic effect of horsetail is a characteristic that should not be underestimated. At higher doses (above 600 mg of extract daily), the diuretic effect is pronounced. Drink at least 1.5–2 liters of water daily during the treatment. Avoid horsetail with kidney stones (risk of displacing deposits) and kidney conditions requiring limited diuresis.
Horsetail and the microbiome and hormones — what many guides overlook
The effect of horsetail on hair and nails is often reduced to just silicon, which is an oversimplification. The plant also contains flavonoids — quercetin and kaempferol — which exhibit anti-androgenic effects in vitro. This may be significant for individuals with androgenetic alopecia: excess dihydrotestosterone (DHT) damages hair follicles, and the inhibition of 5-alpha-reductase by flavonoids is a studied mechanism (Sharquie et al., Dermatological Research, 2019). The effect is moderate and incomparable to finasteride, but it may be an additional asset in a comprehensive hair support routine.
Saponins found in horsetail exhibit mild antibacterial and antifungal properties. This can be helpful for individuals with dandruff or seborrhea — conditions that often hinder the growth of healthy hair due to scalp inflammation. Infusions of horsetail used externally (as a rinse) have a long tradition in European herbal medicine for this reason.
Silicon also affects type I collagen — dominant in skin, bones, and nails. A study published in Archives of Dermatological Research showed that supplementation with orthosilicic acid (a bioavailable form of silicon similar to that from horsetail) for 20 weeks significantly improved skin thickness and strength as well as hair elasticity in women with fine hair structure (Barel et al., Arch Dermatol Res, 2005). This is one of the few high-quality clinical evidence confirming a direct link between silicon supplementation and hair quality.
What should be combined with horsetail for better effect?
Horsetail does not need to work in isolation. Several ingredients synergistically support its action on hair and nails:
Vitamin C is essential for collagen synthesis — without it, silicon cannot be optimally incorporated into protein structures. A daily intake of 200–500 mg from natural sources, such as rose hips, which contain 300–600 mg per 100 g of dry mass and simultaneously provide bioflavonoids that support silicon absorption, is sufficient.
Biotin (vitamin B7) is the most popular supplement for hair and nails — it supports keratin synthesis through different pathways than silicon. Using both simultaneously is safe and may have an additive effect. The recommended dose is 2500–5000 mcg of biotin daily.
Zinc supports the regeneration of hair follicles and inhibits excessive activity of 5-alpha-reductase. Zinc deficiency is one of the more common causes of excessive hair loss in women — it is worth checking its level morphologically before supplementation (normal: 70–120 mcg/dl). Supplementation dose: 10–15 mg of elemental zinc daily.
Hydrolyzed collagen provides ready-made peptides that the body can directly incorporate into the structure of skin, hair, and nails. Clinical studies with 2,500–5,000 mg of hydrolyzed collagen daily for 8–12 weeks showed improved skin elasticity and reduced nail brittleness. Horsetail supports the production of endogenous collagen by providing silicon — exogenous collagen and horsetail are complementary approaches.
Frequently Asked Questions
How much horsetail should I take daily for hair?
Standard doses in studies and phytotherapy are 300–900 mg of dry extract daily in 2–3 doses. For supplements standardized for organic silicon (min. 7% SiO2), 300–450 mg is sufficient. For infusions: 2–3 g of dried herb in 250 ml of water, 2–3 times a day. Always take with vitamin C.
How long should I take horsetail to see effects on hair?
The effects of strengthening and improving hair quality are visible after 8–12 weeks of regular supplementation — hair grows slowly. Nails respond faster (4–8 weeks). A clinical study showed improved hair strength after 90 days (Barel et al., JDD 2005). Consistency is more important than dosage.
Does horsetail have side effects?
Generally safe when used for up to 3 months. It may have a diuretic effect (drink plenty of water). It contains thiaminase — with prolonged use, supplement vitamin B1. Rarely causes allergic reactions. Avoid in cases of kidney disease, stones, and during pregnancy.
Horsetail in capsules or infusion — which is better?
Capsules with standardized extract provide a consistent dose of silicon and are more convenient for long-term supplementation. Infusions are cheaper and contain a broader spectrum of phytochemicals, but the concentration of silicon is less predictable. For beauty purposes, standardized capsules (min. 7% SiO2) offer better control over dosage.
Can horsetail be used with other hair supplements?
Yes. It works well with biotin, collagen, zinc, and vitamin C. Avoid combining with diuretic medications (enhanced effect) and lithium preparations. For epilepsy and seizures medications — consultation with a doctor is necessary.
What silicon content in horsetail is good?
Look for supplements standardized for at least 7–10% silicon dioxide (SiO2) or at least 5% organic silicon. Products without declared standardization may have highly variable content of active ingredients. Horsetail (Equisetum arvense) naturally contains 5–8% silicon dioxide in dry mass — more than any other herb.
Does horsetail work for hair loss?
Horsetail does not treat the causes of hair loss (androgenetic alopecia, thyroid diseases, iron deficiencies). However, it supports the structure of the hair follicle and the strength of the shaft — it may reduce brittleness and improve the quality of regrowth. In cases of severe hair loss, first diagnose the cause with a dermatologist or trichologist.
Does field horsetail help with cellulite and skin?
Yes, although there is little research directly on cellulite. Silicon from extraction strengthens the collagen networks in the dermis, which may improve its elasticity and firmness — factors important for the appearance of cellulite. The effects are visible after 8–16 weeks of regular supplementation and are subtle. Horsetail is sometimes an ingredient in skincare products for cellulite, but as an oral supplement — not as an external balm.
Is field horsetail suitable for men?
Yes. Horsetail supports the condition of hair and nails regardless of gender. Men can take the same doses as women (300–900 mg of extract daily). Flavonoids from horsetail show moderate anti-androgenic activity in vitro, but they have not been proven as an effective treatment for androgenetic alopecia in men — for such needs, a dermatological consultation is necessary.
This article is for informational and educational purposes and does not replace consultation with a doctor. If you are pregnant, breastfeeding, taking medications, or have chronic conditions, consult the use of supplements or herbs with a specialist.
Author: Michał Waluk · Published: 2026-05-04 · Updated: 2026-05-04
