SUPPLEMENTS·SPORTS RESEARCH
Sports Research L-Theanine 200mg
4.6 · 15,000 reviews
Editor score7.9/10
Best for: Anxious minds, caffeine users, daytime-safe calm
Active
L-theanine (Suntheanine) 200mg
Form
MCT-oil softgel
Mechanism
Alpha-wave promotion, non-sedative
Calm without drowsiness — Suntheanine-grade L-theanine in coconut-oil softgels, the daytime-safe anxiety ally that also smooths sleep onset.
L-theanine is the green-tea amino acid that promotes alpha-wave calm without sedation — usable at 3pm before a presentation or at 10pm before bed. Sports Research uses the patented Suntheanine form in MCT-oil softgels for absorption, third-party tested. It won't knock you out; it lowers the arousal floor so sleep can happen.
Price across 3 retailers
Prices checked 2026-07-03amazon
AmazonBest price✓ Fast delivery · easy returns
L-theanine (Suntheanine) 200mg
$17.95
2026-07-03
Prices shown were last checked on 2026-07-03and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-07-03) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- Calms without sedating — daytime safe
- Patented Suntheanine form
- Pairs brilliantly with reduced-caffeine plans
- Third-party tested
What to know before buying
- Subtle by design — no knockout effect
- Costs more than NOW's basic theanine
- Softgels are coconut-derived (allergy note)
At a glance
ActiveL-theanine (Suntheanine) 200mg
FormMCT-oil softgel
MechanismAlpha-wave promotion, non-sedative
Caffeine synergySmooths caffeine jitters
Count60 softgels
Certification3rd-party tested, patented form
Onset~30-40 min
Best timeEvening or stressful moments
Best forCalm-not-drowsy
How it scores
How our 7.9/10 breaks down — rated on the dimensions that matter most for supplements, from hands-on testing and verified specs, not the marketing.
Evidence
8/10
Dosing
8.5/10
Purity
8.5/10
Gentleness
9.5/10
Value
7.5/10
Compare with alternatives
Quick verdicts for the supplements most often considered alongside the Sports Research L-Theanine 200mg.
VS·HEAD-TO-HEAD
Sports Research L-Theanine 200mg vs NOW Foods L-Theanine 200mg (120ct)
The best-value pure L-theanine — 200mg per capsule, GMP-certified, and $17 for 120 servings.
→ Anxiety-driven insomnia, ruminating minds, stackers with melatonin
VS·HEAD-TO-HEAD
Sports Research L-Theanine 200mg vs Doctor's Best High Absorption Magnesium Glycinate 200mg (240ct)
The highest-rated magnesium on Amazon for sleep — glycinate form is chelated for maximum absorption without laxative effects.
→ Restless legs, muscle tension, anxiety-driven insomnia, athletes
VS·HEAD-TO-HEAD
Sports Research L-Theanine 200mg vs Nested Naturals LUNA Sleep Aid
The kitchen-sink botanical — melatonin, valerian, chamomile, L-theanine and magnesium in one capsule, with a melatonin-free version for purists.
→ One-capsule botanical stacks, melatonin-free option
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which one is right for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right sleep gear for your goals. Built by sleep engineers. Free, no signup.
Frequently asked questions
Theanine vs melatonin?
Different jobs: melatonin shifts timing, theanine lowers arousal. Racing-thoughts and stress-driven sleeplessness respond to theanine; jet-lag responds to melatonin.
Suntheanine vs generic theanine?
Suntheanine is the patented pure-isomer form used in most studies; generic blends can include less-active forms. The premium is modest and defensible.
Can I take it with coffee?
Yes — the caffeine+theanine combo is the most-studied nootropic stack; it keeps alertness while trimming jitter.
Softgel vs capsule?
The MCT-oil softgel is Sports Research's absorption argument; NOW's capsule is cheaper. Both deliver; this one costs a little more for the format.
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