10 Best L Theanine Supplements - May 2026

19M consumers helped this year.

Last Updated: 27-05-2026

L Theanine 400mg | 120 Vegan Capsules - 4 Months Supply | Good Alternative to L-Theanine Powder, Gummies and Drops | UK Made L'Theanine Supplement

Nutrivo

9.8

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L Theanine 400mg Capsules - 99.6% Pure L-Theanine | 5 Months Supply - 150 Capsules | Supports Relaxation & Focus, Promotes Calm | Zero Additives, Vegan & Non-GMO | GMP - Certified, Lab Tested

NUTRINATION

9.6

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Best Value

L-Theanine - 401mg - 180 Capsules - 6 Months Supply | with Vitamin B6 & Black Pepper | 1 Capsule per Day | Vegan & Magnesium Stearate-Free - L Theanine Supplement for Men & Women - Made in Europe

WeightWorld

9.5

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L Theanine Enriched with Vitamin B6 - High Strength L Theanine 400mg Natural Nootropics from Green Tea - 120 Vegan L-Theanine Capsules - Made in The UK Theanine Supplements by New Leaf

NEW LEAF PRODUCTS

9.2

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Nutricost L-Theanine 200mg, 120 Capsules - Non-GMO, Gluten Free

Nutricost

9.1

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Vinco L-Theanine Supplement - 400mg x 120 High Strength L Theanine Capsules - 99%+ Purity - Supports Sleep & Relaxation - Non-GMO & Gluten Free - Made in The UK

Vinco Supplements

8.8

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New: L-Theanine - Natural Green Tea Extract (Decaf) - 120 Capsules - 300mg L-Theanine per Serving - Sleep & Relaxation Support - Mental Clarity - Non-Synthetic Theanine - UK Made - Zero Additives

Time Health

8.6

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MM L Theanine | 120 L-Theanine Capsules from Green Tea - High Strength 1000mg Green Tea Extract Providing 400mg L'theanine per Serving | L Theanine Supplement | Non-GMO Gluten Free | Made in UK

Mindful Matter

8.4

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Viridian - L-Theanine and Lemon Balm 90 Veg Caps | 300mg Lemon Balm Extract & 200mg L-Theanine | Supports Cognitive Function | 100% Active Ingredients with No Fillers or Artificial Additives

Viridian

8.2

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L Theanine Enriched with Vitamin B6 - High Strength L Theanine 400mg Natural Nootropics from Green Tea - 360 Vegan L-Theanine Capsules - Made in The UK Theanine Supplements By New Leaf

NEW LEAF PRODUCTS

8.1

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