Amino acids
L-theanine
An amino acid from tea leaves. Taken to feel calm but alert – studies are small, but look positive.
83 products from US online stores, sorted by what 200 mg of L-theanine costs – not by the price per pack.
1.1¢Lowest cost
per 200 mg L-theanine
- Prices checked Nov 1, 2026, US
- No paid placements
What does 200 mg mean?
- L-theanine per serving in most of the products we checked
- 100–225 mgL-theanine per serving in most of the products we checked
- 200 mg is about one serving: half of the 83 products we checked have up to 200 mg per serving, the other half more.
- There’s no official daily amount for L-theanine.
We compare by 200 mg only so products line up – it’s not a recommendation. Not medical advice.
Where products miss quality points
How the 83 products score
- Very good 90+: 3
- Good 75+: 80
- Fair 60+: 0
- Low under 60: 0
- have no seal from an independent testing program
- 96%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 13 whose label says “third-party tested”
The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.
We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works
Pack size
Compare packs of a similar size.
All sizes in one list can affect the results – big packs usually cost less per 200 mg. Pick a size above to compare packs that are alike.
83 products · cheapest per 200 mg L-theanine first
- Rank 1
BulkSupplements
L-Theanine Powder
Powder
80Good qualityCountry not stated1.1¢per 200 mg
Lowest
- Pack
- $52.975,000 servings
- L-theanine per serving
- 200 mg
- Pack lasts
- 5,000 daysif you take 200 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 2
BulkSupplements
L-Theanine Powder
Powder
80Good qualityCountry not stated1.5¢per 200 mg
40% more
- Pack
- $36.972,500 servings
- L-theanine per serving
- 200 mg
- Pack lasts
- 2,500 daysif you take 200 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 3
BulkSupplements
L-Theanine Powder
Powder
80Good qualityCountry not stated2.1¢per 200 mg
96% more
- Pack
- $25.971,250 servings
- L-theanine per serving
- 200 mg
- Pack lasts
- 1,250 daysif you take 200 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 4
Nutricost
L-Theanine, Unflavored
Powder
85Good qualityPacked in USA3.2¢per 200 mg
201% more
- Pack
- $15.95100 g (3.5 oz)500 servings
- L-theanine per serving
- 200 mgin 0.2 g
- Pack lasts
- 500 daysif you take 200 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 5
BulkSupplements
L-Theanine Powder
Powder
80Good qualityCountry not stated4.6¢per 200 mg
334% more
- Pack
- $22.97500 servings
- L-theanine per serving
- 200 mg
- Pack lasts
- 500 daysif you take 200 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 6
Micro Ingredients
L-Theanine Powder
Powder
80Good qualityCountry not stated5¢per 200 mg
371% more
- Pack
- $24.95400 servings
- L-theanine per serving
- 250 mg
- Pack lasts
- 500 daysif you take 200 mg a day
microingredients.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 7
BulkSupplements
L-Theanine Capsules
Capsules
80Good qualityCountry not stated5.5¢per 200 mg
416% more
- Pack
- $19.97365 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 365 daysif you take 1 capsule (200 mg) a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 8
Vitamatic
L-Theanine
Tablets
80Good qualityMade in USA7.1¢per 200 mg
568% more
- Pack
- $16.99240 tablets120 servings
- L-theanine per serving
- 400 mgin 2 tablets
- Pack lasts
- 240 daysif you take 1 tablet (200 mg) a day
vitamaticusa.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 9
Best Naturals
L-Theanine 200 mg
Tablets
80Good qualityMade in USA7.5¢per 200 mg
607% more
- Pack
- $8.99120 tablets
- L-theanine per serving
- 200 mgin 1 tablet
- Pack lasts
- 120 daysif you take 1 tablet (200 mg) a day
shopbestnaturals.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 10
Micro Ingredients
L-Theanine
Softgels
80Good qualityCountry not stated7.5¢per 200 mg
608% more
- Pack
- $29.99400 softgels200 servings
- L-theanine per serving
- 400 mgin 2 softgels
- Pack lasts
- 400 daysif you take 1 softgel (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 11
Nutricost
L-Theanine, 200 mg
Capsules
85Good qualityMade in USA8.3¢per 200 mg
685% more
- Pack
- $19.95240 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 240 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 12
Nutricost
L-Theanine, 200 mg
Capsules
85Good qualityMade in USA$0.10per 200 mg
840% more
- Pack
- $11.95120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 13
Amazing Nutrition
Amazing Formulas L-Theanine 200 Mg
Capsules
85Good qualityMade in USA$0.10per 200 mg
843% more
- Pack
- $11.99120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
amazingnutrition.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 14
Nutricost
L-Theanine Capsules
Capsules
80Good qualityMade in USA$0.12per 200 mg
999% more
- Pack
- $13.97120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 15
Force Factor
L-Theanine, 200 mg
Capsules
80Good qualityMade in USA$0.12per 200 mg
1,000% more
- Pack
- $6.9960 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 16
EVLution Nutrition
L-Theanine, 200 mg
Capsules
80Good qualityMade in USA$0.12per 200 mg
1,078% more
- Pack
- $7.4960 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 17
NaturesPlus
Pro L-Theanine 200
Capsules
80Good qualityCountry not stated$0.15per 200 mg
1,297% more
- Pack
- $8.8860 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 18
Advance Physician Formulas
L-Theanine, 200 mg
Capsules
80Good qualityCountry not stated$0.16per 200 mg
1,450% more
- Pack
- $9.8560 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 19
NOW Foods
L-Theanine Pure Powder
Powder
80Good qualityCountry not stated$0.17per 200 mg
1,464% more
- Pack
- $22.0328 g (1 oz)93 servings
- L-theanine per serving
- 285 mgin 0.3 g
- Pack lasts
- 133 daysif you take 200 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 20
Advance Physician Formulas
L-Theanine 200 mg
Capsules
80Good qualityCountry not stated$0.17per 200 mg
1,465% more
- Pack
- $9.9560 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
physicianformulas.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 21
Double Wood Supplements
L-Theanine, 200 mg
Capsules
80Good qualityCountry not stated$0.17per 200 mg
1,469% more
- Pack
- $19.95120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 22
Double Wood Supplements
L-Theanine Supplement
Capsules
85Good qualityCountry not stated$0.17per 200 mg
1,469% more
- Pack
- $19.95120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
doublewoodsupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 23
PrePrimal
L-Theanine, 200 mg
Capsules
85Good qualityCountry not stated$0.17per 200 mg
1,500% more
- Pack
- $20.34120 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 24
NutraLife
L-Theanine, 200 mg
Capsules
80Good qualityCountry not stated$0.17per 200 mg
1,528% more
- Pack
- $10.3560 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 25
Nature's Truth
L-Theanine, 200 mg
Capsules
80Good qualityCountry not stated$0.18per 200 mg
1,580% more
- Pack
- $10.6860 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 26
California Gold Nutrition
L-Theanine, Featuring AlphaWave, 200 mg
Capsules
80Good qualityCountry not stated$0.18per 200 mg
1,642% more
- Pack
- $11.0760 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 27
Organika
L-Theanine, 225 mg
Capsules
85Good qualityCountry not stated$0.19per 200 mg
1,670% more
- Pack
- $18.9990 capsules
- L-theanine per serving
- 225 mgin 1 capsule
- Pack lasts
- 90 daysif you take 1 capsule (225 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 28
Healthy Origins
L-Theanine (AlphaWave) 100mg
Capsules
80Good qualityCountry not stated$0.22per 200 mg
1,997% more
- Pack
- $19.99180 capsules
- L-theanine per serving
- 100 mgin 1 capsule
- Pack lasts
- 90 daysif you take 2 capsules (200 mg) a day
healthyorigins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 29
Nature's Truth
L-Theanine 200 mg
Capsules
80Good qualityCountry not stated$0.22per 200 mg
2,022% more
- Pack
- $13.4960 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
naturestruth.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 30
Natural Factors
L-Theanine 250 mg
Capsules
85Good qualityCountry not stated$0.23per 200 mg
2,036% more
- Pack
- $33.95120 capsules
- L-theanine per serving
- 250 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (250 mg) a day
naturalfactors.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 31
NutraBio
L-Theanine
Capsules
80Good qualityMade in USA$0.26per 200 mg
2,311% more
- Pack
- $22.9990 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 90 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 32
Natural Factors
L-Theanine 250 mg
Capsules
85Good qualityCountry not stated$0.27per 200 mg
2,411% more
- Pack
- $19.9560 capsules
- L-theanine per serving
- 250 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (250 mg) a day
naturalfactors.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 33
Doctor's Best
L-Theanine AlphaWave 200 mg
Capsules
80Good qualityCountry not stated$0.27per 200 mg
2,416% more
- Pack
- $15.9960 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
drbvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 34
Nutricost
L-Theanine, 200 mg
Capsules
85Good qualityCountry not stated$0.31per 200 mg
2,814% more
- Pack
- $9.2630 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 30 daysif you take 1 capsule (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 35
Sports Research
L-Theanine, 200 mg
Softgels
85Good qualityCountry not stated$0.32per 200 mg
2,965% more
- Pack
- $38.97120 softgels
- L-theanine per serving
- 200 mgin 1 softgel
- Pack lasts
- 120 daysif you take 1 softgel (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 36
Doctor's Best
L-Theanine, 150 mg
Capsules
80Good qualityCountry not stated$0.33per 200 mg
2,975% more
- Pack
- $21.9990 capsules
- L-theanine per serving
- 150 mgin 1 capsule
- Pack lasts
- 45 daysif you take 2 capsules (300 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 37
EVLution Nutrition
L-Theanine (Capsules)
Capsules
80Good qualityMade in USA$0.33per 200 mg
3,045% more
- Pack
- $19.9960 capsules
- L-theanine per serving
- 200 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (200 mg) a day
evlnutrition.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 38
Nature Made
L-Theanine
Tablets
80Good qualityMade in USA$0.34per 200 mg
3,107% more
- Pack
- $16.9950 tablets
- L-theanine per serving
- 200 mgin 1 tablet
- Pack lasts
- 50 daysif you take 1 tablet (200 mg) a day
naturemade.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 39
Doctor's Best
L-Theanine with Suntheanine 150 mg
Capsules
80Good qualityCountry not stated$0.34per 200 mg
3,115% more
- Pack
- $22.9990 capsules
- L-theanine per serving
- 150 mgin 1 capsule
- Pack lasts
- 45 daysif you take 2 capsules (300 mg) a day
drbvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 40
Sports Research
L-Theanine, 200 mg
Softgels
85Good qualityMade in USA$0.35per 200 mg
3,199% more
- Pack
- $20.9760 softgels
- L-theanine per serving
- 200 mgin 1 softgel
- Pack lasts
- 60 daysif you take 1 softgel (200 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
Good to know
- Fact
- 11,235%more per 200 mg for the most expensive product than for the cheapest.
- Fact
- 7,436%more per 200 mg for the cheapest gummies than for the cheapest powder.
How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check
The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.
How we calculate
Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.
Found a mistake or a product we should add? Email us