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Home › Amino acids & derivatives

L-Theanine

Also called theanine, suntheanine.

Cheapest L-theanine today: 14p per 200 mg at Healf, of 9 products at 4 shops. Checked 29 October 2026.

The best price per 200 mg and per month, form by form, across 4 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Email me when it gets cheaper ↓

Comparing L-Theanine

We count the L-theanine a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. A product with one other ingredient is ranked here with an “also contains” note; products that combine L-Theanine with several others are listed separately, because their price buys more than L-theanine. 200 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

L-theanine

Most prices last checked: ; an older price shows its own date. Ranked purely by price per 200 mg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

2 of the 10 cheapest links on this page earn us nothing; the order is price alone. Shop by shop

Priced per 200 mg; powders are often compared per gram.

Compared at 200 mg. Enter the amount you take to see your own costs.

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L-theanine: products ranked by price per 200 mg
RankProductPer 200 mgPer monthLastsBuyHow it is worked out
1
Cheapest per doseL-TheanineHealf · 120 capsules · 120 servings · 200 mg a servingDetails and price historyAdd to my stackgelatine capsule, the listing says
14p£4.124 months£16.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 ÷ 1 per serving = 120
  • In the pack: 120 × 200 mg = 24 g
  • £16.49 ÷ 24 g × 200 mg = 13.7p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 caps”
  • servings stated “Servings Per Container: 120”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “L-Theanine ; 200 mg”

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2
L-TheanineHealf · 60 capsules · 60 servings · 250 mg a servingDetails and price historyAdd to my stackHPMC capsule, the listing says
17p£5.122 months£12.79View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind 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 × 250 mg = 15 g
  • £12.79 ÷ 15 g × 200 mg = 17.1p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60caps”
  • units per serving “One capsule will provide on average”
  • amount per serving “L-Theanine ; 250mg”

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3
L-TheanineW-Wellness · 60 capsules · 60 servings · 250 mg a servingDetails and price historyAdd to my stack
21p£6.202 months£15.49View at W-Wellness (opens in a new tab)Free UK delivery from £50.00, otherwise £3.99 · 2–4 working days to dispatchAmazonFind 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 × 250 mg = 15 g
  • £15.49 ÷ 15 g × 200 mg = 20.7p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Contains: 60 capsules”
  • amount per serving “Each capsule provides 250mg of this key amino acid”

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4
L-Theanine 200mg 60 Capsules60 capsules · 60 servings · 200 mg a servingDetails and price historyAdd to my stackalso contains green tea extractHPMC capsule, the listing says
23p£7.002 months£13.99View at Holland & Barrett (opens in a new tab)Price checked Free delivery over £30.00, otherwise £3.49AmazonFind 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 × 200 mg = 12 g
  • £13.99 ÷ 12 g × 200 mg = 23.3p per 200 mg
  • Amount per serving: stated on the label.
  • Also contains: green tea extract. The price counts the l-theanine only.
What the retailer's listing says
  • pack units “60 Capsules”
  • units per serving “Each 1 Capsule(s) contains”
  • amount per serving “200mg L-theanine per capsule”

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5
L-Theanine 200mgHealf · 60 capsules · 60 servings · 200 mg a servingDetails and price historyAdd to my stackalso contains inositolclaimed: veganHPMC capsule, the listing says
24p£7.102 months£14.19View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind 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 × 200 mg = 12 g
  • £14.19 ÷ 12 g × 200 mg = 23.6p per 200 mg
  • Amount per serving: stated on the label.
  • Also contains: inositol. The price counts the l-theanine only.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Veg Capsule”
  • amount per serving “L-Theanine ; 200 mg”

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6
Theanine 100mg2 capsules a day for 200 mgHigher Nature · Vitamin Planet · 90 capsules · 90 servings · 100 mg a servingDetails and price historyAdd to my stackalso contains vitamin b5, vitamin b6claimed: veganclaimed: vegetarianHPMC capsule, the listing says
50p£14.9545 days£22.42View at Vitamin Planet (opens in a new tab)Price checked Delivery £3.95 · 2–3 days from despatchAmazonFind 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
  • £22.42 ÷ 9 g × 200 mg = 49.8p per 200 mg
  • Amount per serving: stated on the label.
  • Also contains: vitamin b5, vitamin b6. The price counts the l-theanine only.
What the retailer's listing says
  • pack units “90 Caps”
  • amount per serving “Theanine 100mg”

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7
L-TheanineHealf · 60 capsules · 60 servings · 200 mg a servingDetails and price historyAdd to my stackHPMC capsule, the listing says
61p£18.242 months£36.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind 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 × 200 mg = 12 g
  • £36.49 ÷ 12 g × 200 mg = 60.8p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 servings”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “L-Theanine ; 200 mg”

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8
Theanine 100mg2 capsules a day for 200 mgHigher Nature · W-Wellness · 90 capsules · 90 servings · 100 mg a servingDetails and price historyAdd to my stackalso contains vitamin b6, vitamin b5
64p£19.3045 days£28.95View at W-Wellness (opens in a new tab)Free UK delivery from £50.00, otherwise £3.99 · 2–4 working days to dispatchAmazonFind 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
  • £28.95 ÷ 9 g × 200 mg = 64.3p per 200 mg
  • Amount per serving: stated on the label.
  • Also contains: vitamin b6, vitamin b5. The price counts the l-theanine only.
What the retailer's listing says
  • pack units “Contains: 90 capsules”
  • amount per serving “Each capsule provides 100mg of high-quality, decaffeinated L-theanine”

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9
L-TheanineHealf · 60 capsules · 60 servings · 200 mg a servingDetails and price historyAdd to my stackclaimed: vegetarian
66p£19.752 months£39.49View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind 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 × 200 mg = 12 g
  • £39.49 ÷ 12 g × 200 mg = 65.8p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 capsules”
  • amount per serving “L-Theanine ; 200 mg”

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10
L-Theanine Gummies2 gummies a day for 200 mgHealf · 60 gummies · 60 servings · 100 mg a servingDetails and price historyAdd to my stackBerryclaimed: veganclaimed: sugar-free
66p£19.8630 days£19.86View at Healf (opens in a new tab)Free UK delivery over £50.00, otherwise £3.99AmazonFind 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
  • £19.86 ÷ 6 g × 200 mg = 66.2p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 gummies”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Gummy”
  • amount per serving “L-Theanine ; 100 mg”

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11
L-TheanineW-Wellness · 60 capsules · 60 servings · 200 mg a servingDetails and price historyAdd to my stackclaimed: vegetarian
86p£25.932 months£51.85View at W-Wellness (opens in a new tab)Free UK delivery from £50.00, otherwise £3.99 · 2–4 working days to dispatchAmazonFind 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 × 200 mg = 12 g
  • £51.85 ÷ 12 g × 200 mg = 86.4p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Contains: 60 capsules”
  • amount per serving “provide 200mg of high-quality L-theanine in each vegetarian capsule”

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12
L-TheanineHealf · 60 servings · 200 mg a servingDetails and price historyAdd to my stackHPMC capsule, the listing saysOut of stock
55p£16.422 months£32.84View at Healf (opens in a new tab)Price checked Free UK delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 (as stated on the label)
  • In the pack: 60 × 200 mg = 12 g
  • £32.84 ÷ 12 g × 200 mg = 54.7p per 200 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “L-Theanine ; 200 mg”

Is this wrong? Tell us

Price alert

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By shop

Each shop's L-Theanine products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of L-theanine per serving as stated on the label.

Questions

Where can I buy L-Theanine cheapest in the UK?

On 29 October 2026, the cheapest L-Theanine per dose from a UK seller was L-Theanine at Healf (14p per 200 mg, £4.12 a month). Then L-Theanine at Healf (17p per 200 mg, £5.12 a month) and L-Theanine at W-Wellness (21p per 200 mg, £6.20 a month). That is by price per 200 mg, across 4 UK retailers and 12 products, with every price checked daily; the table above shows the working for each.

What is the best price per 200 mg of L-Theanine today?

14p per 200 mg, for L-Theanine at Healf (14p per 200 mg, £4.12 a month), on 29 October 2026. The dearest of the 12 products we price is 86p per 200 mg, and the middle one is 52p.

How much does L-Theanine cost per month?

At one 200 mg dose a day, the cheapest works out at £4.12 a month, for L-Theanine at Healf, on 29 October 2026. Across the 12 products we price it runs from £4.12 to £25.93 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of L-Theanine last?

At one 200 mg dose a day, the packs we price last from 30 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 200 mg” mean?

It is the unit we use to put every product on the same scale: the price of 200 mg of L-theanine, 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 29 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.