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L-Theanine, GABA & Phosphatidylserine

Guides and comparisons How to read a supplement label in the EU

L-theanine, GABA and phosphatidylserine are sold in many strengths and pack sizes, so two labels that look alike can hold very different amounts. This shelf lists single-ingredient capsules, powders and chewables from several brands, plus a few combination formulas. Read the label for the serving size first: some products count one capsule as a serving, others two. The comparison below prices 200 mg of declared L-theanine for three single-ingredient capsules, using today’s price for your delivery country.

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Portion prices are calculated from the net contents. Portion sizes differ between products; this is not a dosing recommendation. Read the full ingredients and directions on the product label.

Price per 200 mg L-theanine = portion price ÷ declared L-theanine per portion (mg) × 200.

L-Theanine - 100 caps Allnutrition L-Theanine - 100 caps Double Strength L-Theanine, 200mg - 120 vcaps NOW Foods Double Strength L-Theanine, 200mg - 120 vcaps L-Theanine AlphaWave - 60 vcaps Doctor's Best L-Theanine AlphaWave - 60 vcaps Suntheanine L-Theanine, 100mg - 60 vcaps Swanson Suntheanine L-Theanine, 100mg - 60 vcaps
Pack size 100 capsules 120 capsules 60 capsules 60 capsules
Main ingredients L-theanine L-theanine L-theanine L-theanine
Label portion 1 capsules 1 capsules 1 capsules 1 capsules
L-theanine per label portion 200 mg 200 mg 200 mg 100 mg
Pack price €17.99 €34.99 €24.99 €22.99
Price per portion €0.18 €0.29 €0.42 €0.38
Price per 200 mg L-theanine €0.18 €0.29 €0.42 €0.77
Allergen information See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement. See the manufacturer’s full allergen statement.
Certifications — — — —
Label information Label information Label information Label information Label information

Prices include VAT for Ireland. Courier delivery: €6.99; free from €65.00. Estimated delivery: 2–4 working days.

Product facts checked: 2026-10-28.

Frequently asked questions

How do I compare two L-theanine products?

Find the L-theanine line on the label and note the milligrams and the serving size, then count how many servings the pack holds. A 60-capsule pack at 200 mg per capsule and a 90-capsule pack at 150 mg per capsule contain different total amounts even though the packs look similar. The table divides the price by the declared L-theanine so the figures are on the same footing.

What do names like Suntheanine or AlphaWave on a label mean?

They are trademarked names for the L-theanine ingredient used in that product. The label still states the amount of L-theanine in milligrams, and that number is what the comparison uses; the trademark does not change it.

Why are some L-theanine products not in the comparison?

The table lists only capsules whose label states the L-theanine in milligrams for a clearly defined serving. Powders are dosed by measuring spoon, chewables and combination formulas have a different composition, and some capsules count two capsules as one serving. Those products stay in the product grid; check their own label.