Extra Strength L-Theanine Supplement 400mg, 400 Capsules (200mg Per Cap)
Cost per serving💚 Top value
$0.05/ serving
400 servings · ~$1.42/mo · 400-day supply
💰 ≈ $47.51 less per bottle than a median L-Theanine
You pay
Price checked 58 minutes ago$18.99
direct from Amazon.com
See the offer on Amazon.com
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💚 Top value — cheapest quartile of the 29 L-Theanine deals we track. compare ($0.17 median)
🔬 Studied dose — the commonly-studied L-Theanine dose is 200 mg/day. One 400mg serving covers it — about $0.02/day at this price.Commonly studied at 100–200 mg, often paired with caffeine.
Prices & availability are accurate as of the last check and may change — always confirm the live price on Amazon.com before buying.
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Lead with cost-per-dose, not vibes.