L-Theanine, ranked by real cost

Typical dose: 200–400mg/day
Used for: Relaxation without sedation, focus and attention, sleep quality, stress reduction
Evidence: Moderate — human studies support anxiolytic and attention-enhancing effects, particularly in combination with caffeine

L-Theanine is an amino acid found naturally in green tea, known for promoting relaxation without drowsiness. It works primarily by increasing alpha brain wave activity and modulating neurotransmitters including GABA, serotonin, and dopamine. It is frequently paired with caffeine for a focused, calm alertness — a combination supported by multiple human studies. Typical doses range from 100–400mg per day, with 200mg being the most common. Suntheanine is the most widely recognized branded form, produced via enzymatic synthesis to yield pure L-isomer theanine. L-Theanine is available as capsules, tablets, and powder. Products below are ranked by cost at your chosen daily dose.

Read our L-Theanine price comparison guide for tips on what to look for when buying l-theanine.

Daily dose (mg) 3rd-party tested Certificate of Analysis 100+ reviews

108 products

#	Product	30-day cost	Supply	Sticker
1	Purisure L-Theanine Powder, 100 g, Pure L Theanine Powder That Promotes Relaxation and Focus, Supplement for Cognitive Function, No Fillers, Non-GMO, 1000 Servings Purisure Store Powder	$0.48	500d	$15.99	View on Amazon
2	BulkSupplements.com L-Theanine Powder - L-Theanine Supplement, L-Theanine 200mg - Amino Amino Supplement, Pure & Gluten Free, 200mg per Serving, 250g (8.8 oz) (Pack of 1) BulkSupplements Store Powder3rd-party tested	$0.53	1250d	$21.97	View on Amazon
3	L-Theanine Powder 100g – L Theanine Supplement, Scoop Included, Pure, Non-GMO, Vegan, Gluten-Free FitPowders Store Powder	$0.67	500d	$11.15	View on Amazon
4	PURE ORIGINAL INGREDIENTS L-Theanine (8 oz) Amino Acid Supplement, No Additives or Fillers PURE ORIGINAL INGREDIENTS Powder	$0.71	1130d	$21.49	View on Amazon
5	Pure L-Theanine Powder Unflavored Amino Acid Supplement Powder from Fine L-Theanine for Smooth Mixing Vegan Friendly Non-GMO No-Additives for Smoothies Drinks and Daily Nutrition Support, 3.2 oz (90g) WHYZ Store PowderFew reviews	$1.00	450d	$14.95	View on Amazon
6	BulkSupplements.com L-Theanine Powder - L-Theanine Supplement, L-Theanine 200mg - Amino Amino Supplement, Pure & Gluten Free, 200mg per Serving, 100g (3.5 oz) (Pack of 1) BulkSupplements Store Powder	$1.14	500d	$18.97	View on Amazon
7	Pure L-Theanine Powder, 100 Grams (1 Year Supply), Filler Free, No GMOs and Vegan Friendly Micro Ingredients Store Powder	$1.20	500d	$15.99	View on Amazon
8	Horbäach L Theanine \| 200mg \| 400 Capsules \| Value Size \| Non-GMO, Gluten Free Supplement Horbäach Store Capsules	$1.50	400d	$19.99	View on Amazon
9	BulkSupplements.com L-Theanine Capsules - L-Theanine Supplement, L-Theanine 200mg, Theanine Pills - Amino Amino Supplement, Gluten Free - 1 Theanine Capsule per Serving, 365 Capsules BulkSupplements Store Capsules3rd-party tested	$1.56	365d	$18.97	View on Amazon
10	L-Theanine Powder 25g – L Theanine Supplement, Scoop Included, Pure, Non-GMO, Vegan, Gluten-Free FitPowders Store Powder	$1.57	125d	$6.55	View on Amazon
11	Bronson L-Theanine 200mg (Double-Strength) with Passion Flower Herb, Non-GMO Gluten-Free Soy-Free Stress Management Supplement, 360 Capsules Bronson Store Capsules	$1.66	360d	$19.97	View on Amazon
12	Nutricost Caffeine with L-Theanine, 100mg of Each, 240 Capsules, 240 Servings - Non-GMO and Gluten Free Nutricost Store Capsules3rd-party tested	$1.74	120d	$13.95	View on Amazon
13	Best Naturals L-Theanine 200mg per Tablet (400mg per 2 Tablets) - Promotes Relaxation Without Drowsiness - 120 Vegetarian Tablets - (120 Count (Pack of 2)) Best Naturals Store Tablets	$2.25	240d	$17.98	View on Amazon
14	Carlyle L-Theanine 200mg Supplement \| 120 Capsules \| Non-GMO, Gluten Free Carlyle Store Capsules	$2.25	120d	$8.99	View on Amazon
15	Vitamatic Caffeine Pills with L-Theanine – 300 mg Per Tablet – 120 Vegetarian Tablets (Pack of 2, Total 240 Tablets) Vitamatic Store Tablets	$2.37	240d	$18.99	View on Amazon
16	Bronson L-Theanine 200mg (Double-Strength) with Passion Flower Herb, Non-GMO Gluten-Free Soy-Free Stress Management Supplement, 120 Capsules Bronson Store Capsules	$2.49	120d	$9.97	View on Amazon
17	Best Naturals L-Theanine 200mg per Tablet (400mg per 2 Tablets) - Promotes Relaxation Without Drowsiness - 120 Vegetarian Tablets - (120 Count (Pack of 1)) Best Naturals Store Tablets	$2.50	120d	$9.99	View on Amazon
18	Oxify L- Theanine 200 mg \| 120 Tablets \| Gluten-Free, Non-GMO \| Supplement Made in USA Oxify TabletsFew reviews	$2.50	120d	$9.99	View on Amazon
19	Nature's Trove L-Theanine 200mg 120 Vegetarian Capsules Nature's Trove Store Capsules3rd-party tested	$2.50	120d	$9.98	View on Amazon
20	L-Theanine 400mg, 400 Capsules – Extra Strength Theanine Supplement – Amino Acids for Focus & Relaxation Support – Non-GMO & Gluten Free DEAL SUPPLEMENT Capsules	$2.85	400d	$18.99	View on Amazon
21	KAL L Theanine 25 mg ActivMelt - Relaxation, Stress, Mood and Focus Supplement - Delicious Natural Pineapple Flavor with Stevia - Vegetarian - 120 Servings, 120 Instant Dissolve Micro Tablets KAL Store Tablets	$2.96	15d	$11.85	View on Amazon
22	NatureBell L-Theanine Supplement - 400 Capsules - 400mg Max Potency Amino Acid Support - for Relaxation, Calm, and Focus - Non-Drowsy Free-Form Formula* NatureBell Store Capsules3rd-party tested	$3.00	400d	$19.99	View on Amazon
23	NutraChamps L-Theanine 200mg Capsules, Double-Strength L-Theanine Liquid with Vitamin D3, Organic Coconut Oil, 120 Vegan Capsules (Pack of 2) NutraChamps Store Capsules	$3.12	240d	$24.95	View on Amazon
24	PRISTINE'S L Theanine 200mg Supplement Capsules - 3rd Party Tested Non GMO -150 Day Supply - Relaxation & Sleep Quality Support Capsules - Vegan, cGMP Facility & Gluten Free Glass Bottles PRISTINE'S Store Capsules	$3.20	150d	$15.99	View on Amazon
25	Horbäach L-Theanine 400mg \| 400 Capsules \| High Potency Supplement \| Non-GMO & Gluten Free Horbäach Store Capsules	$3.29	400d	$21.96	View on Amazon
26	Caffeine Pills with L-Theanine - 180 Energy Pills for Women & Men - Clean & Long-Lasting Focused Energy - Sustained Release 100mg Caffeine + 200mg L Theanine - No Crash Capsules, Vegan Supplement NutraChamps Store Capsules	$3.32	180d	$19.95	View on Amazon
27	Healthy Origins L-Theanine 100 mg (AlphaWave, Supports Relaxation Without Drowsiness, Brain Support, Non-GMO, Gluten Free), 180 Veggie Caps Healthy Origins Store Capsules	$3.33	88d	$19.99	View on Amazon
28	PURE ORIGINAL INGREDIENTS L-Theanine (365 Capsules) Amino Acid, No Magnesium or Rice Filler, Lab Verified PURE ORIGINAL INGREDIENTS Capsules	$3.62	801d	$21.99	View on Amazon
29	Micro Ingredients L-Theanine 400mg, 400 Softgels \| Highly Bioavailable with Coconut Oil \| Extra Strength Theanine Amino Acid \| Calm & Relaxation Support + Focus Supplement \| Non-GMO, Gluten Free Micro Ingredients Store Softgels	$3.75	400d	$24.99	View on Amazon
30	Vitamatic L-Theanine Supplement 400mg per Serving - 240 Tablets - Non-GMO, Gluten Free-2 Pack Vitamatic Store TabletsFew reviews	$4.00	480d	$31.99	View on Amazon
31	NOW Foods Supplements, L-Theanine 100 mg with Decaf Green Tea, Stress Management*, 90 Veg Capsules NOW Foods Store Capsules	$4.23	45d	$12.70	View on Amazon
32	NutraChamps L-Theanine 200mg Capsules \| Double-Strength L-Theanine Liquid with Vitamin D3, Organic Coconut Oil \| Supports Mood, Focus, Stress Relief \| for Kids & Adults \| 120 Vegan Capsules NutraChamps Store Capsules	$4.24	120d	$16.95	View on Amazon
33	Vitamatic L-Theanine Supplement 400mg per Serving - 240 Tablets - Non-GMO, Gluten Free Vitamatic Store Tablets	$4.25	240d	$16.99	View on Amazon
34	PureFormulas L Theanine Supplement 100 mg, L-Theanine Supports Stress Levels, Relaxed State, Mood, Sleep, Dairy Free, Soy Free, Non-GMO 60 Vegetarian Capsules PureFormulas Store Capsules	$4.25	60d	$16.99	View on Amazon
35	Nature's Truth L Theanine \| 200mg \| 60 Quick Release Capsules \| Non-GMO & Gluten Free Supplement Nature's Truth Store Capsules	$4.49	60d	$8.99	View on Amazon
36	Max Strength Caffeine L Theanine Pills No Jitters Peak Energy Focus Performance Alertness Caffeine Pills 200mg & 500mg L-Theanine Capsules No Crash & Drowsiness, Potent 120 count, 2-Pack BioWisdom Nutraceuticals Store CapsulesFew reviews	$4.61	600d	$36.90	View on Amazon
37	Horbäach L-Theanine Supplement \| 400mg \| 120 Powder Capsules \| Non-GMO & Gluten Free Horbäach Store Capsules	$4.94	120d	$9.89	View on Amazon
38	Force Factor L Theanine 200mg, Extra Strength L-Theanine Supplement for Stress Relief, and Supporting Calm and Relaxation, Vegan, Non-GMO, No Gelatin, 60 Vegetable Capsules Force Factor Store Capsules	$4.99	60d	$9.98	View on Amazon
39	L-Theanine 200mg Double Strength - Supports Health Sleep Response and Relaxation - 120 Capsules (Third Party Tested, Gluten Free) by Double Wood Double Wood Supplements Store Capsules	$4.99	120d	$19.95	View on Amazon
40	Nootropics Depot L-Theanine Capsules 200mg (180 Count) \| Promotes Relaxation \| Supports Healthy Stress Levels + Sleep Cycles \| Promotes Cognitive Function + Focus \| Amino Acid Supplement Nootropics Depot Store Capsules	$5.00	180d	$29.99	View on Amazon
41	tnvitamins L-Theanine Capsules 500 mg Per Serving, 180 Capsules \| Calm Focus & Relaxation Support* \| Helps Promote Stress Balance, Mental Clarity & Mood Support* \| Non-GMO, Made in USA tnvitamins Store Capsules	$5.66	225d	$16.99	View on Amazon
42	L-Theanine Spring Valley 100 mg Support 100 Count + me Gusta Sticker ME GUSTA SHOP CapsulesFew reviews	$5.91	50d	$19.69	View on Amazon
43	Jarrow Formulas® Regular Strength Theanine 100 mg, Dietary Supplement, 60 Capsules, 60 Day Supply Jarrow Formulas Store Capsules	$5.99	30d	$11.99	View on Amazon
44	Amazon Elements - L-Theanine, 200mg, 60 Capsules, Vegan and gluten free, 2 month supply (Packaging may vary) Amazon Elements Store Capsules	$6.07	60d	$12.13	View on Amazon
45	NOW Foods Supplements, L-Theanine Pure Powder, Tension Management*, Amino Acid, 1-Ounce NOW Foods Store Powder	$6.39	133d	$19.80	View on Amazon
46	VALI Caffeine 50mg & L Theanine 100mg - Caffeine Pills & L-Theanine for Smart Smooth Energy & Focus Supplement. Nootropic Brain Booster Cognitive Support Stack & Focused Clarity. 120 Veggie Capsules VALI Store Capsules	$6.50	60d	$25.99	View on Amazon
47	Nootropics Depot L-Theanine Capsules 200mg (90 Count) \| Promotes Relaxation \| Supports Healthy Stress Levels + Sleep Cycles \| Promotes Cognitive Function + Focus \| Amino Acid Supplement Nootropics Depot Store Capsules	$6.66	90d	$19.99	View on Amazon
48	Whole Foods Market, L-Theanine 100 MCG 60 CT 365 by Whole Foods Market Store Capsules	$6.74	30d	$13.49	View on Amazon
49	L-Theanine Gummies \| 200mg L Theanine per Serving \| 120 Servings \| Zero Sugar \| 3rd-Party Lab Tested FloHydro Store Gummies3rd-party tested COA Few reviews	$7.50	120d	$29.99	View on Amazon
50	Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count Doctor's BEST Store Capsules	$7.66	68d	$22.99	View on Amazon
51	MaryRuth's L Theanine 200mg Liquid Drops \| Mood Support for Adults & Kids \| Focus Supplement \| Natural Sleep Support \| Vegan \| Non-GMO \| Gluten Free \| 30 Servings (Pack of 2) Liquid	$7.79	60d	$15.58	View on Amazon
52	Superior Labs L-Theanine 250 mg Capsules, Non-GMO, Promotes Non Drowsy Relaxation & Helps Ease Everyday Stress, Supports Healthy Sleep, Promotes a Focused Mind, High Absorption, 90 Veg Caps Superior Labs Store Capsules	$8.98	113d	$26.95	View on Amazon
53	Sports Research Double Strength L-Theanine Supplement - Suntheanine Softgels for Focus, Relaxation & Alertness - Non-Drowsy Support Made with Coconut Oil, Non-GMO & Gluten Free - 200mg, 120 Count Softgels3rd-party tested	$9.21	120d	$36.85	View on Amazon
54	Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 60 Chewable Tablets (30 Servings) Natural Factors Store Tablets	$9.44	60d	$18.87	View on Amazon
55	Natural Vitality Calm Mind, Magnesium Citrate + L-Theanine Powder, Supplement for Stress Relief, Gluten Free & Vegetarian, Unflavored, 12 oz. Natural Vitality Powder	$9.55	113d	$35.99	View on Amazon
56	(3 Pack) Smarter L-Theanine 250mg Supplement, in Non-GMO Flaxseed Oil, 150 Liquid Softgels SmarterVitamins Store Softgels	$9.58	188d	$47.88	View on Amazon
57	CyberCerix Liposomal L-Theanine 500mg, Complex with GABA 200mg & Magnesium 100mg, Extra Strength Supplement for Calm, Relaxation & Focus, Gluten Free - 60 Capsules CyberCerix Capsules	$9.74	150d	$19.49	View on Amazon
58	Country Life L-Theanine Fast-Acting 100mg, 60 Chewable Tablets, Mint- Flavored, Certified Gluten Free, Certified Vegan Country Life Store Tablets	$9.91	30d	$19.81	View on Amazon
59	L Theanine 400 mg \| L-Theanine Stress Relief \| Extra Strength Supplement \| Lab Tested \| Relaxation, Sleep & Calm Support \| For Men & Women \| Plant Based, Non-GMO & Gluten-Free \| 120 Vegan Capsules NUTRAHARMONY Store Capsules	$9.95	120d	$19.89	View on Amazon
60	Sports Research Double Strength L-Theanine Supplement - Suntheanine Softgels for Focus, Relaxation & Alertness - Non-Drowsy Support Made with Coconut Oil, Non-GMO & Gluten Free - 200mg, 60 Count Sports Research Store Softgels3rd-party tested	$9.98	60d	$19.95	View on Amazon
61	L-Theanine Supplement with Caffeine, Organic Liquid Caffeine 50mg w. L-Theanine 100mg, Vitamin B12 B6 for Focused Energy, Alertness & Recess Mood, Nootropic Brain Drops for Women & Men丨30 Days Supply GLOVVUUP Liquid3rd-party tested	$9.98	15d	$9.98	View on Amazon
62	Phytoral Potent L-Theanine Liquid Drops - High Absorption L-Theanine for Kids & Adults Calm & Relaxation Support - Premium Quality Drops Ideal for Children and Adults Liquid - 2 Fl Oz Phytoral Store Liquid	$9.99	30d	$9.99	View on Amazon
63	BESTVITE Double Strength Suntheanine L-Theanine 200mg – Patented & Clinically Studied – 60 Vegetarian Capsules – Vegan – No Stearates – Non GMO – Gluten Free – Relaxation Support BESTVITE Store Capsules3rd-party tested	$10.00	60d	$19.99	View on Amazon
64	Jarrow Formulas® Theanine 100 mg Gummies, Dietary Supplement That Promotes Calmness, 60 Apple-Flavored Gummies, 60 Day Supply Jarrow Formulas Store Gummies	$10.00	30d	$19.99	View on Amazon
65	Nature's Way L-Theanine, Stress Support, Promotes Relaxation, 200 mg per 2-Capsule Serving, Vegan, 180 Capsules (Packaging May Vary) Nature's Way Store Capsules	$10.40	90d	$31.21	View on Amazon
66	Jarrow Formulas Extra Strength L Theanine 200mg Dietary Supplement that Promotes Relaxation, Supplement for Relaxation Support, 60 Veggie Capsules, 60 Day Supply Jarrow Formulas Store Capsules	$10.49	60d	$20.99	View on Amazon
67	365 by Whole Foods Market, L Theanine Double Strength 200mg, 60 Count 365 by Whole Foods Market Store Capsules	$10.74	60d	$21.48	View on Amazon
68	GABA L-Theanine 900 mg - Magnesium \| Vitamin B6 - Calm, Sleep, Relaxation & Mood Support - Lab Tested - 750 mg Gamma AminoButyric Acid, 150 mg L-Theanine - Non-Habit Forming, Vegan - 120 Capsules NUTRAHARMONY Store Capsules3rd-party tested	$11.45	45d	$22.89	View on Amazon
69	Sports Research L-Theanine Supplement with Caffeine & Coconut MCT Oil - Focused Energy, Alertness & Relaxation Without Drowsiness - 200mg L Theanine, 100mg Organic Caffeine - 60 Liquid Softgels Sports Research Store Softgels	$11.48	60d	$22.95	View on Amazon
70	PROTOCOL FOR LIFE BALANCE L-Theanine 200mg - Normal Stress Relief - Non-Drowsy - 60 Veg Caps PROTOCOL FOR LIFE BALANCE Store Capsules	$11.50	60d	$23.00	View on Amazon
71	Source Naturals Serene Science L-Theanine with Magnesium and GABA - 60 Tablets Source Naturals Store Tablets	$11.97	30d	$11.97	View on Amazon
72	Product gallery Superior Source Store Tablets	$11.99	50d	$19.99	View on Amazon
73	200mg L-Theanine & 150mg Vitamin C Liquid Spray for Kids & Adults - Peach Extract Flavor - Plant-Based, Non-GMO, Gluten Free, No Added Sweeteners, Alcohol-Free - 2 Fl Oz (60 ml) - 60 Day Supply GIVOL Store Liquid	$12.90	60d	$25.80	View on Amazon
74	L-Theanine 200mg – High Potency Amino Acid Supplement from Green Tea Leaves – Non-GMO, Vegan – 60 Veggie Capsules partiQlar Store Capsules3rd-party tested COA Few reviews	$13.00	60d	$25.99	View on Amazon
75	L Theanine Liquid Drops, Pure L-Theanine 400mg for Adults and Kids, Organic High Absorption L Theanine Supplement, Natural Focus Supplement, Non-GMO \| Gluten Free \| 30 Servings JINGYAT Store Liquid	$13.97	60d	$13.97	View on Amazon
76	SOLARAY L-Theanine 200mg with Green Tea - Healthy Mood, Relaxation and Occasional Stress Support - Lab Verified, Vegan, Gluten Free - 90 Servings, 90 VegCaps SOLARAY Store Capsules	$14.95	90d	$44.84	View on Amazon
77	L-Theanine Gummies for Kids & Adults, L'Theanine 400mg Chewable L Theanine Supplement for Calm, Zzz & Relaxation Support, Vegan, Organic, Raspberry Flavor, 60 Counts XIAAN Store Gummies	$14.99	60d	$14.99	View on Amazon
78	Country Life Suntheanine L-Theanine – 60 Vegan Capsules \| Natural Stress Relief Supplement with Inositol \| Promotes Relaxation, Focus & Better Sleep \| Certified Gluten-Free, Non-Drowsy Formula Country Life Store Capsules	$15.14	60d	$30.29	View on Amazon
79	SFI Health Klaire Labs L-Theanine - 100mg Suntheanine to Promote Promote Relaxation (60 Capsules) SFI Health Store Capsules	$15.50	30d	$30.99	View on Amazon
80	High Absorption L-Theanine Liquid Drops - Nootropic Focus Supplement with L Theanine 200mg Per Serving and Chamomile Extract Supplement for Adults and Kids Relaxation and Focus - 2 Fl Oz Natures Craft Store Liquid	$15.99	30d	$15.99	View on Amazon
81	SOLARAY L Theanine 200mg, Mood Support Supplement with Vitamin B6 - Calming Support During Occasional Stress - Natural Lemon Lime Flavor - 60-Day Guarantee, Lab Verified - 75 Servings, 75 Chewables SOLARAY Store Tablets	$17.60	75d	$43.99	View on Amazon
82	Natural Factors Suntheanine L-Theanine 100 mg - Health Supplement for Calm Outlook - L-Theanine Supplement Supports Relaxing Sleep & Aids Against Drowsiness - 120 Chewable Tablets (60 Servings) Natural Factors Store Tablets	$17.84	60d	$35.67	View on Amazon
83	GNC L-Theanine 200mg, Promotes Relaxation, 60 Capsules Capsules	$17.99	60d	$35.99	View on Amazon
84	Life Extension L-Theanine, Amino Acid theanine, Calm, Relaxation, Mood, Gluten-Free, Non-GMO, Vegetarian, 200 mg, 60 Capsules Life Extension Store Capsules	$18.00	30d	$18.00	View on Amazon
85	Svasthya Body & Mind 100% Pure L-Theanine Liquid Supplement – 2FL. OZ. (60ML) for Stress Reduction, Improved Concentration Svasthya Body & Mind Store LiquidFew reviews	$18.57	29d	$17.95	View on Amazon
86	FWS L Theanine Liquid Drops, 200mg 99% Pure Bioactive L-Theanine, Organic, Natural, Vegan, Non GMO Helps to Promote Calmness, Relaxation, Improved Mood, Restful Sleep, for Adults and Kids FIREWATERSTAR HEALTH SUPPLEMENTS Store Liquid	$19.99	30d	$19.99	View on Amazon
87	WellVeraVida L Theanine Caffeine Liquid Drops, High Potency L-Theanine 100mg w. Caffeine Vitamin B12 B6, Natural Nootropic Brain for Smooth Energy Focus Alertness, 6X Stronger Than Pills Powder Gum WellVeraVida Store Powder3rd-party tested	$19.99	15d	$19.99	View on Amazon
88	Wiley's Finest Relax Focus - Daily Supplement for Stress Support - Contains L-Theanine, GABA, Vitamin B6 & Magnesium - 30 Capsules (30 Servings) Wiley's Finest Store CapsulesFew reviews	$19.99	30d	$19.99	View on Amazon
89	duwhot L Theanine Gummies, 200/400mg L-Theanine Supplement for Adults & Kids, Natural Stress Relief, Relaxation, Zzz & Focus Support Gummy, Organc,Vegan, Low Sugar,Non-Drowsy,Lemon Flavor,60 Chewables duwhot Store Gummies	$19.99	60d	$19.99	View on Amazon
90	EZ Melts L-Theanine 200 mg - Stress & Relaxation Support Supplement - No Artificial Flavors - No Drowsiness - Non-GMO & Vegan - Sweet Cherry - 120 Dissolvable Tablets (60 Servings) EZ Melts Store Tablets	$20.50	60d	$40.99	View on Amazon
91	Life Extension Theanine XR™ Stress Relief – L-Theanine – Promotes a Calm Response to Daytime Stress – Non-GMO, Gluten-Free, Vegetarian – 30 Tablets Life Extension Store Tablets	$21.00	60d	$21.00	View on Amazon
92	KAL Mood Magnesium Powder with L-Theanine - Mandarin Flavor Magnesium Supplement - Relaxation Support, High Absorption, No Added Sugar, Vegan, Gluten Free, Made Without Soy - 40 Servings, 9.8 oz KAL Store Powder	$21.14	40d	$28.19	View on Amazon
93	MaryRuth's L Theanine 200mg Liquid Drops \| Mood Support for Adults & Kids \| Focus Supplement \| Natural Sleep Support \| Vegan \| Non-GMO \| Gluten Free \| 30 Servings MARYRUTH'S Store Liquid	$21.95	30d	$21.95	View on Amazon
94	kindnature L-Theanine 200mg Gummies for Kids 4+ & Adults – Pure Single-Ingredient Calm & Focus Chewables – Clinical Dose, Non-Drowsy Relaxation – Vegan, Mixed Berry, Non-GMO – 60 Ct kindnature Store Gummies	$21.95	30d	$21.95	View on Amazon
95	EZ Melts L-Theanine 200 mg - Stress & Relaxation Support Supplement - No Artificial Flavors - No Drowsiness - Non-GMO & Vegan - Sweet Cherry - 60 Dissolvable Tablets (30 Servings) EZ Melts Store Tablets	$21.99	30d	$21.99	View on Amazon
96	KEY ELEMENTS Liquid GABA with L Theanine Supplement \| GABA 500mg and L-Theanine 200mg with Lemon Balm Extract and Magnesium with Vitamin B6 KEY ELEMENTS Store Liquid	$21.99	30d	$21.99	View on Amazon
97	Liposomal L Theanine Gummies, Chewable L-Theanine 400mg with GABA Supplement for Kids & Adults, Stress Relief, zzZ and Relaxation, Focus Support, Natural Blueberry Flavor, 60 Count Elysx Store Gummies	$21.99	60d	$21.99	View on Amazon
98	Integrative Therapeutics L-Theanine - Amino Acid Supplement for Stress & Relaxation Support* - Vegan, Gluten-Free & Dairy-Free - Third-Party Tested - 60 Capsules (30 Servings) Integrative Therapeutics Store Capsules	$22.00	30d	$22.00	View on Amazon
99	THORNE - Theanine - 200 mg of L-Theanine - Supports a Healthy Stress Response, Relaxation, Focus, Memory & Positive Mood - Increases Brain Alpha-Wave Production* - Third-Party Certified - 90 Capsules THORNE Store Capsules3rd-party tested	$22.67	90d	$68.00	View on Amazon
100	Lunakai USA Made Magnesium Glycinate Gummies 426mg with L-Theanine – Calm, Sleep, Stress Relief for Adults & Kids, Non-GMO, Vegan, 60ct Lunakai Store Gummies	$25.95	8d	$25.95	View on Amazon
101	DAVINCI Labs Liposomal L-Theanine - Dietary Supplement to Support Stress Management, Concentration, Focus and Relaxation* - Vegetarian - Gluten and Soy-Free - Dairy-Free - 30 ml DAVINCI Store LiquidFew reviews	$27.88	25d	$46.46	View on Amazon
102	Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation, Stress & Nervous System - 120 Capsules Pure Encapsulations Store Capsules	$28.75	120d	$115.00	View on Amazon
103	Dr. Mercola L-Theanine Plus GABA - Supports Relaxation - Focus & Cognitive Function - Stress Support Supplement - 200 mg L-Theanine - 100 mg GABA - 60 Capsules Dr. Mercola Store Capsules	$29.97	30d	$29.97	View on Amazon
104	L-Theanine 200mg with Saffron, GABA, Magnesium Glycinate & Vitamin B6, Advanced Complex Formula for Mood Relaxation & Stress Relief & Sleep Support, 60 Vegan Capsules, Non GMO, Gluten-Free HojaSana Store CapsulesFew reviews	$31.10	30d	$31.10	View on Amazon
105	Pure Encapsulations L-Theanine - Amino Acid Supplement to Support Relaxation, Stress & Nervous System - 60 Capsules Pure Encapsulations Store Capsules	$32.75	60d	$65.50	View on Amazon
106	Quicksilver Scientific Liposomal GABA + L Theanine - Calm, Stress Response & Brain Support - Bioavailable GABA Supplement with L Theanine 100mg (1.7oz/50ml) Quicksilver Scientific Store Liquid	$44.40	13d	$37.00	View on Amazon
107	Designs for Health Liposomal NeuroCalm - Liquid GABA + L-Theanine to Support Calm + Healthy Stress Response (25 Servings / 1.7oz) Designs for Health Store Liquid	$50.99	13d	$42.49	View on Amazon
108	XYMOGEN L-Theanine - 400 mg as Suntheanine - Relaxation, Focus & Stress Support - Amino Acid Supplement - Non-Drowsy - Vegetarian, Non-GMO & Gluten Free - 60 Capsules XYMOGEN Store Capsules	$54.99	60d	$54.99	View on Amazon

Buying notes for L-Theanine

How to read the label

L-Theanine labels are usually easy to read, but still confirm the serving size and whether the product is standalone. Labels reviewed for this update included 200 mg one-capsule or one-softgel servings, 400 mg two-capsule servings, bulk powder servings, and products using branded forms such as Suntheanine or AlphaWave.

What changes the real cost

Powder can be extremely cheap per 200 mg serving, while capsules, tablets, softgels, liquids, and gummies add convenience premiums. Products bundled with caffeine, MCT oil, magnesium, or sleep/stress ingredients can cost more because they are selling a stack, not just L-Theanine.

Common comparison traps

A 400 mg serving may mean two capsules, and an L-Theanine + caffeine softgel may not fit shoppers who want caffeine-free theanine. Branded forms can be useful quality signals, but compare the actual L-Theanine amount and serving count before paying extra.

Evidence context

L-Theanine has moderate evidence for relaxation, stress, and sleep-quality outcomes. TrueServing compares labeled L-Theanine cost at the reference dose; it does not rank nootropic stacks, caffeine ratios, branded ingredients, or sleep claims.

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