Cheapest 5-HTP UK – price per 100 mg

Comparing 5-HTP

We count the 5-HTP a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Products that combine 5-HTP with other ingredients are listed separately, because their price buys more than 5-HTP. 100 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

5-HTP

5-HTP, 5-HTP: products ranked by price per 100 mg
Rank	Product	Per 100 mg	Per month	Lasts	Buy	How it is worked out
1	Cheapest per dose5-HTP Capsules 100mg270 capsules · 270 servings · 100 mg a servingDetails and price history Add to my stack	13p	£3.89	9 months	£34.99View at Bulk (opens in a new tab)Free delivery over £49.00, 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: 270 ÷ 1 per serving = 270 In the pack: 270 × 100 mg = 27 g £34.99 ÷ 27 g × 100 mg = 13p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “270 Capsules” units per serving “Per Serving (1 Capsule)” amount per serving “[5-HTP ; 100mg]” Is this wrong? Tell us
2	Best value under 6 months' supply5-HTP Capsules 100mg90 capsules · 90 servings · 100 mg a servingDetails and price history Add to my stack	16p	£4.66	3 months	£13.99View at Bulk (opens in a new tab)Free delivery over £49.00, 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 × 100 mg = 9 g £13.99 ÷ 9 g × 100 mg = 15.5p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “90 Capsules” units per serving “Per Serving (1 Capsule)” amount per serving “[5-HTP ; 100mg]” Is this wrong? Tell us
3	5-HTP Griffonia Seed Extract 750mgZipVit · 180 tablets · 180 servings · 61.3 mg a servingDetails and price history Add to my stack	16p	£4.90	4 months	£17.99View at ZipVit (opens in a new tab)Free delivery AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 180 ÷ 1 per serving = 180 In the pack: 180 × 61.3 mg = 11 g £17.99 ÷ 11 g × 100 mg = 16.3p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “750mg - 180” units per serving “Take 1 tablet daily” amount per serving “5HTP ; 61.25mg” herb equivalent “Griffonia Seed 12:1 Extract ; 750mg (Eq.)” Is this wrong? Tell us
4	5-HTP Griffonia Seed Extract 750mgZipVit · 90 tablets · 90 servings · 61.3 mg a servingDetails and price history Add to my stack	22p	£6.53	55 days	£11.99View at ZipVit (opens in a new tab)Free delivery 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 × 61.3 mg = 5.51 g £11.99 ÷ 5.51 g × 100 mg = 21.8p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “750mg - 90” units per serving “Take 1 tablet daily” amount per serving “5HTP ; 61.25mg” herb equivalent “Griffonia Seed 12:1 Extract ; 750mg (Eq.)” Is this wrong? Tell us
5	Griffonia Seed Extract 5-HTP Supplement - Natural Source, Extracted From 800Mg of Griffonia Seeds60 tablets · 60 servings · 100 mg a servingDetails and price history Add to my stackTesting claimed on labelclaimed: veganclaimed: vegetarian	26p	£7.75	2 months	£15.50View at Lamberts Healthcare (Nature's Best) (opens in a new tab)Free delivery over £20.00, otherwise £2.50 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 × 100 mg = 6 g £15.50 ÷ 6 g × 100 mg = 25.8p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “Specifications: 60 Tablets” amount per serving “provides 100mg of pure 5-HTP” herb equivalent “Extracted From 800Mg of Griffonia Seeds” Is this wrong? Tell us
6	Serotone 5HTP 100mgHigher Nature · Vitamin Planet · 90 capsules · 90 servings · 100 mg a servingDetails and price history Add to my stackalso contains vitamin b3, vitamin b6, vitamin b7…	29p	£8.79	3 months	£26.37View at Vitamin Planet (opens in a new tab)Delivery £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 × 100 mg = 9 g £26.37 ÷ 9 g × 100 mg = 29.3p per 100 mg Amount per serving: stated on the label. Also contains: vitamin b3, vitamin b6, vitamin b7, vitamin b9, zinc. The price counts the 5-htp only. What the retailer's listing says pack units “90 Capsules” units per serving “1 capsule daily” amount per serving “5HTP 100mg” Is this wrong? Tell us
7	5-HTP 50mg 60 TabletsHealthAid · Lloyds Pharmacy · 60 tablets · 60 servings · 50 mg a servingDetails and price history Add to my stack	46p	£13.79	30 days	£13.79View 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 × 50 mg = 3 g £13.79 ÷ 3 g × 100 mg = 46p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “60 Tablets” units per serving “take one to two tablets daily” amount per serving “5-HTP 50mg” Is this wrong? Tell us
8	5-HTP · 60 capsules · 60 servings · 50 mg a servingDetails and price history Add to my stackclaimed: vegan	88p	£26.39	30 days	£26.39View 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: 60 ÷ 1 per serving = 60 In the pack: 60 × 50 mg = 3 g £26.39 ÷ 3 g × 100 mg = 88p per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “60 caps” units per serving “Each capsule typically contains” amount per serving “5-HTP (5-Hydroxytryptophan) ; 50 mg” Is this wrong? Tell us
9	Griffonia Extract · 60 capsules · 30 servings · 100 mg a servingDetails and price history Add to my stackclaimed: vegetarian	£1.35	£40.54	30 days	£40.54View 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: 60 ÷ 2 per serving = 30 In the pack: 30 × 100 mg = 3 g £40.54 ÷ 3 g × 100 mg = £1.35 per 100 mg Amount per serving: stated on the label. What the retailer's listing says pack units “60 caps” servings stated “Servings Per Container: 30” units per serving “Serving Size: 2 capsules” amount per serving “Providing 100 mg (30%) 5-Hydroxytryptophan” extract mass “5-Hydroxytryptophan (5HTP) ; 330 mg” Is this wrong? Tell us
+	Serotone 5HTP 100mgHigher Nature · 90 capsules · 90 servings · 100 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains vitamin b3, vitamin b6, vitamin b9…	38p	£11.48	3 months	£34.45View at Higher Nature (opens in a new tab)Free delivery over £40.00, otherwise £3.90 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 × 100 mg = 9 g £34.45 ÷ 9 g × 100 mg = 38.3p per 100 mg Amount per serving: stated on the label. Also contains: vitamin b3, vitamin b6, vitamin b9, vitamin b7, zinc. The price counts the 5-htp only. What the retailer's listing says pack units “90 Capsules” units per serving “One capsule typically provides” amount per serving “5-HTP (L-5-hydroxytryptophan) ; 100mg” Is this wrong? Tell us
+	Serotone 5HTP 100mgHigher Nature · 30 capsules · 30 servings · 100 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains vitamin b3, vitamin b6, vitamin b9…	45p	£13.45	30 days	£13.45View at Higher Nature (opens in a new tab)Free delivery over £40.00, otherwise £3.90 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 × 100 mg = 3 g £13.45 ÷ 3 g × 100 mg = 44.8p per 100 mg Amount per serving: stated on the label. Also contains: vitamin b3, vitamin b6, vitamin b9, vitamin b7, zinc. The price counts the 5-htp only. What the retailer's listing says pack units “30 Capsules” units per serving “One capsule typically provides” amount per serving “5-HTP (L-5-hydroxytryptophan) ; 100mg” Is this wrong? Tell us
+	Serotone 50mgHigher Nature · Vitamin Planet · 90 capsules · 90 servings · 50 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains vitamin b6, zinc, vitamin b7…	46p	£13.76	45 days	£20.64View at Vitamin Planet (opens in a new tab)Delivery £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 × 50 mg = 4.5 g £20.64 ÷ 4.5 g × 100 mg = 45.9p per 100 mg Amount per serving: stated on the label. Also contains: vitamin b6, zinc, vitamin b7, vitamin b9, vitamin b3. The price counts the 5-htp only. What the retailer's listing says pack units “90 Capsules” amount per serving “5HTP 50mg” Is this wrong? Tell us
+	Serotone 5-HTP 50mgHigher Nature · 90 capsules · 90 servings · 50 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains vitamin b3, vitamin b6, vitamin b9…	60p	£17.97	45 days	£26.95View at Higher Nature (opens in a new tab)Free delivery over £40.00, otherwise £3.90 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 × 50 mg = 4.5 g £26.95 ÷ 4.5 g × 100 mg = 59.9p per 100 mg Amount per serving: stated on the label. Also contains: vitamin b3, vitamin b6, vitamin b9, vitamin b7, zinc. The price counts the 5-htp only. What the retailer's listing says pack units “90 Capsules” units per serving “One capsule typically provides” amount per serving “5-HTP (L-5-hydroxytryptophan) ; 50mg” Is this wrong? Tell us
+	5-HTP GummiesWeightWorld · 30 servings · 100 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains lemon balm, tryptophan	63p	£18.98	30 days	£18.98View at WeightWorld (opens in a new tab)Free delivery over £35.00, 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: 30 (as stated on the label) In the pack: 30 × 100 mg = 3 g £18.98 ÷ 3 g × 100 mg = 63.3p per 100 mg Amount per serving: stated on the label. Also contains: lemon balm, tryptophan. The price counts the 5-htp only. What the retailer's listing says servings stated “Servings per Container: 30” units per serving “Serving Size: 2 Gummies” amount per serving “5-HTP (as Griffonia Seed Extract) ; 100 mg” Is this wrong? Tell us
+	5-HTP Sleep Gummies - Blackcurrant · 60 gummies · 30 servings · 57 mg a servingDetails and price history Add to my stackBlackcurrantCombination: price counts the 5-htp onlyalso contains lemon balm, vitamin b6claimed: veganclaimed: vegetarian	64p	£19.28	17 days	£10.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 60 ÷ 2 per serving = 30 In the pack: 30 × 57 mg = 1.71 g £10.99 ÷ 1.71 g × 100 mg = 64.3p per 100 mg Amount per serving: stated on the label. Also contains: lemon balm, vitamin b6. The price counts the 5-htp only. What the retailer's listing says pack units “60GUMMIES” servings stated “30servings” units per serving “Consume 2 gummies daily” amount per serving “of which 5-HTP ; 57.0mg” extract mass “Griffonia simplicifolia Seed 5:1 Extract ; 190.0mg” Is this wrong? Tell us
+	PM: Sleep Dust - Ceremonial Cacao · 14 sachets · 14 servings · 100 mg a servingDetails and price history Add to my stackCeremonial CacaoCombination: price counts the 5-htp onlyalso contains magnesium, l theanine, reishi…claimed: veganclaimed: vegetarianclaimed: gluten-free	£1.96	£58.91	14 days	£27.49View 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: 14 ÷ 1 per serving = 14 In the pack: 14 × 100 mg = 1.4 g £27.49 ÷ 1.4 g × 100 mg = £1.96 per 100 mg Amount per serving: stated on the label. Also contains: magnesium, l theanine, reishi, valerian, passionflower, ashwagandha, apigenin, hemp seed extract, honokiol, spine seed extract (ziziphus), vitamin b6, ceremonial cacao powder. The price counts the 5-htp only. What the retailer's listing says pack units “14 sachets” servings stated “Servings Per Container 14” units per serving “Serving Size 1 Sachet” amount per serving “5-HTP (5 Hydroxytryptophan) ; 100 mg” Is this wrong? Tell us
+	Bio.Revive Kinetic · 90 capsules · 30 servings · 50 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains ginger, panax ginseng, amalaki fruit 600mg…	£2.16	£64.90	15 days	£32.45View 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: 90 ÷ 3 per serving = 30 In the pack: 30 × 50 mg = 1.5 g £32.45 ÷ 1.5 g × 100 mg = £2.16 per 100 mg Amount per serving: stated on the label. Also contains: ginger, panax ginseng, amalaki fruit 600mg, haritaki fruit 500mg, poria cocos 390mg, artichoke leaf powder 200mg, zizyphus jujuba 200mg, bitter orange bioflavonoid extract (microbiomex®) 50mg, liquorice root powder 20mg. The price counts the 5-htp only. What the retailer's listing says pack units “90 caps” units per serving “3 Capsules” 5-HTP “(99% 5-HTP)” amount per serving “Griffonia Seed Extract (99% 5-HTP) ; 50mg” Is this wrong? Tell us
+	Cycle SupportMyOva · W-Wellness · 60 capsules · 30 servings · 33 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains vitamin b6, sulforaphane, ashwagandha…claimed: veganclaimed: vegetarian	£3.64	£109.09	10 days	£36.00View at W-Wellness (opens in a new tab)Free delivery from £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: 60 ÷ 2 per serving = 30 In the pack: 30 × 33 mg = 990 mg £36.00 ÷ 990 mg × 100 mg = £3.64 per 100 mg Amount per serving: stated on the label. Also contains: vitamin b6, sulforaphane, ashwagandha, curcumin, chamomile, l theanine, rhodiola. The price counts the 5-htp only. What the retailer's listing says pack units “Contains: 60 capsules” servings stated “Servings per container: 30” units per serving “2 capsules (daily serving) typically provide” amount per serving “5-HTP (mg) ; 33” Is this wrong? Tell us
+	Chill FoodPatrick Holford · Vitamin Planet · 60 capsules · 30 servings · 65 mg a servingDetails and price history Add to my stackCombination: price counts the 5-htp onlyalso contains magnesium, glutamine, taurine…Out of stock	£1.13	£33.97	20 days	£22.08View at Vitamin Planet (opens in a new tab)Delivery £3.95 AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.	Show the working Servings: 60 ÷ 2 per serving = 30 In the pack: 30 × 65 mg = 1.95 g £22.08 ÷ 1.95 g × 100 mg = £1.13 per 100 mg Amount per serving: stated on the label. Also contains: magnesium, glutamine, taurine, tryptophan, l theanine, hops. The price counts the 5-htp only. What the retailer's listing says pack units “60 Caps” units per serving “Amount per 2 capsules” amount per serving “5-HTP (Griffonia seed extract) ; 65 mg” Is this wrong? Tell us

Questions

Where can I buy 5-HTP cheapest in the UK?

On 20 October 2026, the cheapest 5-HTP per dose from a UK seller was 5-HTP Capsules 100mg at Bulk (13p per 100 mg, £3.89 a month). Then 5-HTP Capsules 100mg at Bulk (16p per 100 mg, £4.66 a month) and 5-HTP Griffonia Seed Extract 750mg at ZipVit (16p per 100 mg, £4.90 a month). That is by price per 100 mg, across 6 UK retailers and 9 products, with every price checked daily; the table above shows the working for each.

What is the best price per 100 mg of 5-HTP today?

13p per 100 mg, for 5-HTP Capsules 100mg at Bulk (13p per 100 mg, £3.89 a month), on 20 October 2026. The dearest of the 9 products we price is £1.35 per 100 mg, and the middle one is 26p.

How much does 5-HTP cost per month?

At one 100 mg dose a day, the cheapest works out at £3.89 a month, for 5-HTP Capsules 100mg at Bulk, on 20 October 2026. Across the 9 products we price it runs from £3.89 to £40.54 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of 5-HTP last?

At one 100 mg dose a day, the packs we price last from 30 days to 9 months; the middle one lasts 2 months. Each row says how long its pack lasts at the dose you enter.

What does “per 100 mg” mean?

It is the unit we use to put every product on the same scale: the price of 100 mg of 5-HTP, 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.

5-HTP

Comparing 5-HTP

5-HTP

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How we work out these prices

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