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St John's wort

Also called st johns wort, st. john's wort, hypericum perforatum, hypericum.

The best price per 300 mg and per month, form by form, across 4 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing st John's wort

We count the St John's wort extract a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Products that combine st John's wort with other ingredients are listed separately, because their price buys more than St John's wort extract. 300 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

St John's wort (0.3% hypericin)

Prices last checked: 20 October 2026. Ranked purely by price per 300 mg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

St John's wort, St John's wort (0.3% hypericin): products ranked by price per 300 mg
Rank	Product	Per 300 mg	Per month	Lasts	Buy	How it is worked out
1	Cheapest per doseSt John's Wort MoodBoost Tablets 250mg THR90 tablets · 90 servings · 250 mg a servingDetails and price history Add to my stackTesting claimed on label	21p	£6.40	2 months	£15.99View at Simply Supplements (opens in a new tab)Free delivery from £20.00, otherwise £1.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 90 ÷ 1 per serving = 90 In the pack: 90 × 250 mg = 22.5 g £15.99 ÷ 22.5 g × 300 mg = 21.3p per 300 mg Amount per serving: extract weight stated on the label. What the retailer's listing says amount per serving “each easy-to-swallow tablet contains 250mg of St John's Wort extract” confirmed values “confirmed from the retailer's own product page, not this listing's text: pack units 90; pack unit type tablet; units per serving 1.0” Is this wrong? Tell us
2	Mood Lift Max Strength St John's Wort Tablets90 tablets · 90 servings · 425 mg a servingDetails and price history Add to my stack	23p	£6.92	4 months	£29.40View at Boots (opens in a new tab)Free delivery over £25.00, otherwise £3.95 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 90 ÷ 1 per serving = 90 In the pack: 90 × 425 mg = 38.3 g £29.40 ÷ 38.3 g × 300 mg = 23.1p per 300 mg Amount per serving: extract weight stated on the label. What the retailer's listing says pack units “90 tablets” units per serving “Take one tablet once daily” amount per serving “Each coated tablet contains 425 mg of extract” Is this wrong? Tell us
3	St John's Wort Mood Relief60 tablets · 60 servings · 370 mg a servingDetails and price history Add to my stack	28p	£8.51	2 months	£20.99View at Healthspan (opens in a new tab)Free delivery over £30.00, otherwise £2.45 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 60 ÷ 1 per serving = 60 In the pack: 60 × 370 mg = 22.2 g £20.99 ÷ 22.2 g × 300 mg = 28.4p per 300 mg Amount per serving: extract weight stated on the label. What the retailer's listing says pack units “60 tablets” units per serving “Take one tablet” amount per serving “Each film-coated tablet contains: 370mg of extract (as dry extract) from St John's Wort aerial parts (Hypericum perforatum L.) (5-7:1)” herb equivalent “equivalent to 1,850mg” Is this wrong? Tell us
4	Max Strength St John's Wort Mood Lift Tablets30 tablets · 30 servings · 425 mg a servingDetails and price history Add to my stack	33p	£9.88	43 days	£14.00View at Boots (opens in a new tab)Free delivery over £25.00, otherwise £3.95 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 30 ÷ 1 per serving = 30 In the pack: 30 × 425 mg = 12.8 g £14.00 ÷ 12.8 g × 300 mg = 32.9p per 300 mg Amount per serving: extract weight stated on the label. What the retailer's listing says pack units “30 tablets” units per serving “Take one tablet once daily” amount per serving “Each coated tablet contains 425 mg of extract” Is this wrong? Tell us
5	KarmaMood Max Strength St Johns Wort Extract 425mg 60 TabletsSchwabe · Lloyds Pharmacy · 60 tablets · 60 servings · 425 mg a servingDetails and price history Add to my stackOut of stock	34p	£10.15	3 months	£28.75View at Lloyds Pharmacy (opens in a new tab)Free delivery over £30.00, otherwise £2.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 60 ÷ 1 per serving = 60 In the pack: 60 × 425 mg = 25.5 g £28.75 ÷ 25.5 g × 300 mg = 33.8p per 300 mg Amount per serving: extract weight stated on the label. What the retailer's listing says pack units “60 Tablets” units per serving “Take 1 tablet daily” amount per serving “Each coated tablet contains 425mg of dry extract from St John's Wort” Is this wrong? Tell us
+	Mood Magic - 25 stick packsJoySpring · · 25 sachets · 25 servings · 15 mg a servingDetails and price history Add to my stackFruit punchCombination: price counts the st john's wort onlyalso contains saffron, magnesium, tryptophan…Testing claimed on labelclaimed: sugar-free	£27.19	£815.76	1 day	£33.99View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 25 ÷ 1 per serving = 25 In the pack: 25 × 15 mg = 375 mg £33.99 ÷ 375 mg × 300 mg = £27.19 per 300 mg Amount per serving: extract weight stated on the label. Also contains: saffron, magnesium, tryptophan, passionflower, lemon balm, chamomile, holy basil, vitamin d (cholecalciferol). The price counts the st john's wort only. What the retailer's listing says pack units “25 stick packs” servings stated “Servings Per Container: 25” units per serving “Serving Size: 1 Packet (7.7g)” amount per serving “(Aerial Parts) Extract (10:1) ; 15 mg” Is this wrong? Tell us

St John's wort at a glance

St John's wort is a flowering plant whose leaves and flowering tops are dried into a standardised extract, usually stated as 0.3 per cent hypericin. People take it above all for low mood, and also around the menopause and, less often, for memory and focus. Reviews pooling dozens of randomised trials in mild to moderate depression found more people responding than on placebo, and much the same result as a prescription antidepressant with fewer side effects, though reviews do not all agree. The point reviewers return to is that it changes how the body clears many prescription medicines, the contraceptive pill among them. In forums, the interaction question dominates and feeling calmer is the commonest report.

Read the full overview: why people take it, how it works and what people report

How we work out these prices

We count the weight of extract per serving. Where a label quotes a “whole herb equivalent” (for example “5,000 mg from a 10:1 extract”), we use the actual extract weight. Branded, standardised extracts are compared separately from unbranded ones.

Questions

Where can I buy st John's wort cheapest in the UK?

On 20 October 2026, the cheapest st John's wort per dose from a UK seller was St John's Wort MoodBoost Tablets 250mg THR at Simply Supplements (21p per 300 mg, £6.40 a month). Then Mood Lift Max Strength St John's Wort Tablets at Boots (23p per 300 mg, £6.92 a month) and St John's Wort Mood Relief at Healthspan (28p per 300 mg, £8.51 a month). That is by price per 300 mg, across 4 UK retailers and 5 products, with every price checked daily; the table above shows the working for each.

What is the best price per 300 mg of st John's wort today?

21p per 300 mg, for St John's Wort MoodBoost Tablets 250mg THR at Simply Supplements (21p per 300 mg, £6.40 a month), on 20 October 2026. The dearest of the 5 products we price is 34p per 300 mg, and the middle one is 28p.

How much does st John's wort cost per month?

At one 300 mg dose a day, the cheapest works out at £6.40 a month, for St John's Wort MoodBoost Tablets 250mg THR at Simply Supplements, on 20 October 2026. Across the 5 products we price it runs from £6.40 to £10.15 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of st John's wort last?

At one 300 mg dose a day, the packs we price last from 43 days to 4 months; the middle one lasts 2 months. Each row says how long its pack lasts at the dose you enter.

What does “per 300 mg” mean?

It is the unit we use to put every product on the same scale: the price of 300 mg of St John's wort extract, whatever the pack size or serving size. It is a comparison unit, not a recommendation of how much to take. Use the “Your daily dose” box to see costs at the amount you actually take.

Why is a product I have seen in the shops missing?

If a retailer’s listing does not let us confirm the amount per serving, the pack size or the form, we do not guess and we do not show the product. It appears once its label has been read and confirmed.

How up to date are the prices?

Prices on this page were last checked on 20 October 2026. Every table shows the date its prices were checked. Always confirm the price on the retailer’s site before buying.

Do retailers pay to appear higher?

No. We earn a commission when you buy through our links, but the order is set only by price per dose. No retailer or brand can pay for position.

Comparing st John's wort

St John's wort (0.3% hypericin)

Only combination products for this form

How we work out these prices

Questions