Cheapest L-Theanine in the UK — price per 200 mg (September 2026)

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

L-Theanine — L-theanine

Prices last checked: 17 September 2026. Ranked purely by price per 200 mg — a comparison unit, not a recommendation. We may earn commission from these links; it never affects the order.

Product	Pack	Per serving	Per 200 mg	Per month	Lasts	Buy
1 L-Theanine 200mg 60 CapsulesHolland & Barrettalso contains egcgships from — check delivery and duties	60 capsules · 60 servings	200 mg	£0.233	£7.00	2 months	£13.99View at Holland & Barrett
Show the working Servings: 60 ÷ 1 per serving = 60 In the pack: 60 × 200 mg = 12 g £13.99 ÷ 12 g × 200 mg = £0.233 per 200 mg Amount per serving: stated on the label. Also contains: egcg. The price counts the l-theanine only. From the retailer's listing: pack units “60 Capsules” units per serving “Take 1 capsule per day” amount per serving “200mg L-theanine per capsule” extract ratio “50:1 extract, equivalent to 25000.00mg Green Tea” extract mass “Green Tea Extract (Camellia Sinensis, Leaf) (50:1 extract, equivalent to 25000.00mg Green Tea) ; 500mg” herb equivalent “equivalent to 25000.00mg Green Tea” Is this wrong? Tell us
+ L-Theanine 100mg - Green Tea ExtractHigher Nature · Holland & BarrettCombination: price counts the l-theanine onlyalso contains green tea extract, vitamin b5, vitamin b6ships from — check delivery and dutiesclaimed: vegan	90 capsules · 90 servings	100 mg	£0.643	£19.30	45 days	£28.95View at Holland & Barrett
Show the working Servings: 90 ÷ 1 per serving = 90 In the pack: 90 × 100 mg = 9 g £28.95 ÷ 9 g × 200 mg = £0.643 per 200 mg Amount per serving: stated on the label. Also contains: green tea extract, vitamin b5, vitamin b6. The price counts the l-theanine only. From the retailer's listing: pack units “90 Vegan Capsules” amount per serving “L-Theanine 100mg” Is this wrong? Tell us

Nothing from UK-based sellers here yet. Tick the boxes under “Show” to include combination products or sellers shipping from abroad.

Questions

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 are some products “unverified”?

If a retailer’s listing does not let us confirm the amount per serving, the pack size or the form, we do not guess. The product is shown separately with the reason, and never appears in the ranked table.

How up to date are the prices?

Prices on this page were last checked on 17 September 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 may earn a commission if you buy through our links, but the order is set only by price per dose. No retailer or brand can pay for position.

L-Theanine: price per 200 mg

L-Theanine — L-theanine

Questions