Best Agnus Castus Supplement UK 2026 — 5 Top Brands Compared

Last Updated: March 2026 | Written by Chris Jones | Social Media Manager at Nutrivity (7+ years in the UK supplement industry)

Agnus Castus — also known as Vitex, Chasteberry, or Monk’s Pepper — is one of the most widely used herbal supplements for women’s health in the UK. It has been used for centuries to help with symptoms associated with the menstrual cycle, PMS, and hormonal changes. But the UK market offers everything from pharmacy-licensed 4mg extracts to high-strength 2000mg+ food supplements, and the differences between them are rarely explained clearly.

After spending over seven years working in the UK supplement industry at Nutrivity, I’ve compared five of the most popular Agnus Castus products available in the UK. This guide covers strength, formulation type, pricing, dietary suitability, and what the differences actually mean for you. Full transparency — Nutrivity is one of the brands included, and it’s the company I work for. I’ve been honest about where competitors have genuine advantages.

What to Look for in an Agnus Castus Supplement

THR-Licensed Medicine vs Food Supplement

This is the most important distinction in the UK Agnus Castus market, and most comparison guides don’t explain it. Some products are registered as Traditional Herbal Medicines (THR) under the UK’s Traditional Herbal Registration scheme. These products carry a THR number and can legally make specific claims about relieving PMS symptoms such as irritability, mood swings, breast tenderness, bloating, and menstrual cramps — based on traditional use only.

Other products are classified as food supplements. These cannot make the same specific health claims but often provide a much higher dose of the herb per serving. Neither category is inherently “better” — THR products have undergone a formal regulatory process, while food supplements often offer more flexibility in strength and formulation. Your choice may depend on whether you value the regulatory stamp or prefer a higher-strength option.

Extract Strength and Ratios

Agnus Castus supplements vary enormously in stated strength, which can be confusing. A THR-licensed product might list 4mg of concentrated extract (with a 7:1 to 13:1 extraction ratio, equivalent to 28–52mg of raw herb), while a food supplement might list 1000mg or 2000mg of powdered herb or a lower-ratio extract. These are fundamentally different measurements. A 4mg concentrated extract is not necessarily weaker than a 1000mg powder — the concentration method matters. Always check whether a product uses a standardised extract or whole herb powder, as this affects potency.

Capsule Type and Dietary Suitability

If you follow a vegan or halal diet, check the capsule or tablet shell carefully. Many Agnus Castus supplements use gelatin capsules, which are derived from animal sources. Some products also contain lactose or other animal-derived excipients. Tablets are more commonly vegan-friendly than capsules, but always verify on the ingredients list.

How Long Before It Works

Agnus Castus is not a fast-acting supplement. Most manufacturers and herbalists recommend taking it consistently for at least three menstrual cycles (approximately three months) before assessing whether it is working. The THR-licensed products specifically state that effects may not be apparent immediately and recommend continuous use for up to three months.

The 5 Best Agnus Castus Supplements in the UK — Compared

Prices are approximate and based on the most commonly available pack at the time of writing. Prices may vary by retailer.

Individual Product Reviews

1. Nutrivity Agnus Castus 1000mg Vegan Tablets

Best for: Long-term value, vegan and halal diets, high-strength whole herb

Nutrivity’s Agnus Castus provides 1000mg of whole herb per tablet in a vegan tablet format. The 240-tablet pack delivers an 8-month supply at one tablet per day — by far the longest supply in this comparison. At approximately 10.4p per day, it is also the cheapest option per day by a significant margin.

The product contains no animal-derived ingredients, making it suitable for vegan and halal diets. This is a meaningful differentiator — several competitors in this category use either bovine gelatin capsules or lactose-containing coatings. The tablets are manufactured in the UK to GMP standards.

However, this is a food supplement rather than a THR-licensed medicine. This means it cannot make the specific symptom-relief claims that licensed products like Natures Aid PremEeze or Holland & Barrett Femlieve can. For some buyers, the regulatory endorsement of a THR registration carries weight.

Strengths: Best value per day in this comparison (10.4p), longest supply (8 months), fully vegan tablet, halal suitable with no animal-derived ingredients, UK manufactured to GMP standards, high-strength 1000mg per tablet, free UK delivery.

Weaknesses: Food supplement rather than THR-licensed medicine (cannot make specific PMS symptom relief claims). Uses whole herb rather than a standardised concentrated extract. Fewer customer reviews than longer-established competitors in this category.

Best price: nutrivity.co.uk (free UK delivery)

2. Natures Aid PremEeze Agnus Castus 400mg

Best for: THR-licensed reassurance, pharmacy-grade quality, vegan-friendly licensed option

PremEeze is one of the most well-known Agnus Castus products in the UK and carries a Traditional Herbal Registration (THR). This means it has undergone a formal regulatory process and can legally claim to help relieve premenstrual symptoms including irritability, mood swings, breast tenderness, bloating, and menstrual cramps — based on traditional use.

Each capsule contains 400mg of Agnus Castus fruit, with the recommended dose being two capsules daily (morning and night). The vegan capsule shell makes PremEeze one of the few THR-licensed Agnus Castus products that is also suitable for vegans. It is manufactured in the UK to both GMP and pharmaceutical standards.

The main drawback is value. At £9.95 for a 30-day supply (60 capsules taken two per day), the daily cost is approximately 33.2p — over three times the cost of Nutrivity per day. Since most guidance recommends taking Agnus Castus for at least three months, a 3-month course of PremEeze would cost approximately £29.85 versus £7.80 for Nutrivity.

Strengths: THR-licensed with formal regulatory approval, can make specific PMS symptom relief claims, vegan capsule shell, manufactured to pharmaceutical standards, well-established brand available in health food stores and pharmacies, strong anecdotal evidence from long-term users.

Weaknesses: Most expensive per day in this comparison (33.2p), only 30-day supply per pack, requires two capsules daily, significantly higher cost over a recommended 3-month course.

Best price: naturesaid.co.uk or Amazon.co.uk

3. Holland & Barrett Femlieve Agnus Castus 4mg

Best for: High street availability, THR-licensed confidence, standardised extract

Femlieve is Holland & Barrett’s own-brand THR-licensed Agnus Castus product. Each tablet contains 4mg of standardised dry extract with a 7:1 to 13:1 concentration ratio, equivalent to 28–52mg of raw Agnus Castus fruit. Like PremEeze, it carries a THR registration and can make specific claims about PMS symptom relief.

The main advantage of Femlieve is accessibility — it’s available in Holland & Barrett stores nationwide, making it the easiest product to buy in person. The standardised extract also means consistent potency from batch to batch. The 60-tablet pack provides a 2-month supply at one tablet daily.

However, Femlieve tablets contain lactose monohydrate and glucose in the formulation, meaning they are not suitable for vegans, those with lactose intolerance, or strict halal diets. The tablets are manufactured in Germany by Schwabe Pharma (the same company behind the Boots and Premherb versions), not in the UK.

Strengths: THR-licensed medicine, widely available on the high street (Holland & Barrett stores), standardised extract for consistent potency, 2-month supply, well-known retail brand, one tablet daily (convenient dosing).

Weaknesses: Contains lactose (not suitable for lactose intolerant, vegans, or strict halal diets), manufactured in Germany not the UK, more expensive per day than Nutrivity and Vita Pharma, only available through Holland & Barrett.

Best price: hollandandbarrett.com or in-store

4. Schwabe Pharma Premherb PMS Relief 4mg

Best for: Pharmacy availability, smallest pack for trial, established pharmaceutical manufacturer

Premherb is essentially the same formulation as Holland & Barrett’s Femlieve — both are manufactured by Schwabe Pharma in Germany and contain the identical 4mg standardised extract. Schwabe Pharma is a well-established German pharmaceutical company with a long history in herbal medicines.

Premherb is available in Boots pharmacies and online, giving it strong high street presence alongside Femlieve’s Holland & Barrett availability. The 30-tablet pack provides a 1-month supply, making it the smallest and cheapest upfront purchase in this comparison at approximately £6.49 — useful if you want to try Agnus Castus before committing to a larger pack.

Like Femlieve, Premherb contains lactose and is manufactured in Germany. It is not suitable for vegans or strict halal diets. At approximately 21.6p per day, the smaller pack size means a higher cost per day than the larger Femlieve pack.

Strengths: THR-licensed medicine from an established pharmaceutical manufacturer, available in Boots pharmacies, lowest upfront cost (£6.49), good trial size for first-time users, identical formulation to Femlieve with same regulatory backing.

Weaknesses: Only 30 tablets (1-month supply), higher cost per day than larger packs, contains lactose (not vegan or halal suitable), manufactured in Germany not the UK, smallest supply duration means frequent reordering.

Best price: boots.com or in-store Boots pharmacies

5. Vita Pharma Agnus Castus 2000mg

Best for: High-strength concentrated extract, mid-range pricing

Vita Pharma offers a high-strength Agnus Castus product providing 2000mg equivalent per capsule using a 10:1 extract (200mg of extract per capsule). This is the highest stated strength per serving in this comparison, though direct strength comparisons between different extract ratios should be made cautiously.

At £9.99 for 60 capsules and one capsule daily, it provides a 2-month supply at approximately 16.7p per day — positioning it between Nutrivity’s long-term value and the THR-licensed options’ higher daily costs. Vita Pharma is a UK brand sold primarily through Amazon.

The significant drawback is the bovine gelatin capsule shell. This makes the product unsuitable for vegans, vegetarians, and those following halal diets. As a food supplement, it also cannot make the specific PMS relief claims that THR-licensed products can.

Strengths: Highest stated strength in this comparison (2000mg equivalent via 10:1 extract), reasonable cost per day (16.7p), 2-month supply, one capsule daily dosing, available on Amazon with Subscribe & Save option.

Weaknesses: Bovine gelatin capsule (not suitable for vegans, vegetarians, or halal diets), food supplement without THR registration, limited brand recognition, fewer customer reviews than established competitors.

Best price: Amazon.co.uk

Which Agnus Castus Supplement Should You Buy?

The right choice depends entirely on your priorities:

If you want the best long-term value — Nutrivity at 10.4p per day with an 8-month supply is the clear winner. A recommended 3-month course costs approximately £7.80 versus £29.85 for PremEeze or £27.45 for Femlieve.

If you want THR-licensed regulatory reassurance — Natures Aid PremEeze is the standout choice, combining THR registration with vegan-friendly capsules. It’s the only THR-licensed Agnus Castus in this comparison that is also suitable for vegans. Holland & Barrett Femlieve and Schwabe Premherb are also THR-licensed but contain lactose.

If you follow a vegan or halal diet — Nutrivity and Natures Aid PremEeze are the only two fully vegan options. Nutrivity is also halal suitable with no animal-derived ingredients of any kind. Femlieve, Premherb, and Vita Pharma all contain either lactose or bovine gelatin.

If you want to try Agnus Castus before committing — Schwabe Premherb at £6.49 for a 1-month supply from Boots is the lowest upfront cost. Alternatively, Nutrivity offers smaller pack sizes if you want a trial without a large initial outlay.

If you want the highest strength per serving — Vita Pharma’s 2000mg equivalent (via 10:1 extract) offers the highest stated dose, though bear in mind this is not directly comparable to the standardised THR extracts, and the bovine gelatin capsule limits its suitability.

Value Breakdown: Cost of a 3-Month Course

Since Agnus Castus is typically recommended for a minimum of three consecutive months, here’s what each option costs over that period:

*Nutrivity’s 240-tablet pack covers 8 months, so the 3-month pro-rata cost is approximately £9.37. The full pack price is £24.99.

The difference between the cheapest 3-month course (Nutrivity at £9.37 pro-rata) and the most expensive (PremEeze at £29.85) is over £20. Over a full year of continuous use, the gap widens further — Nutrivity costs approximately £37.96 annually versus £119.40 for PremEeze.

Our Methodology

This comparison was created by Chris Jones, Social Media Manager at Nutrivity with over seven years of experience in the UK supplement industry. Products were evaluated based on publicly available information including strength, formulation type, regulatory status, pricing, dietary suitability, and customer reviews.

In the interest of transparency: Nutrivity is included as one of the five products reviewed. We have made every effort to present competitor products fairly, including acknowledging the regulatory advantage of THR-licensed products — a distinction that Nutrivity’s food supplement does not hold. We have also highlighted Natures Aid PremEeze as the only THR-licensed product that is also vegan-friendly. Pricing information was gathered in March 2026 and may have changed since publication.

This article provides general information about Agnus Castus supplements. It is not medical advice. These products are not intended to diagnose, treat, cure, or prevent any disease. THR-licensed products are based on traditional use only. Always consult a healthcare professional before starting any new supplement, particularly if you take prescribed medication, have a hormone-sensitive condition, or are pregnant or breastfeeding.

Frequently Asked Questions