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L-Theanine Suntheanine 200mg
RIVERGROVE
L-Theanine
SUNTHEANINE 200MG
Sleep

L-Theanine

Suntheanine 200mg
4.8 · 8 reviews
$20.40
$24.00
· 60 capsules · 60 servings
1
vegangluten freesugar free
200mg Suntheanine® L-theanine
Focused calm without sedation
Great with coffee — smooths out jitters
COA on every batch
Clean-label promise
3rd-party tested
Free ship $75+
The story

Why we made this

The green tea compound responsible for the 'calm alertness' of tea rather than the buzz of coffee. Stack it with your morning coffee to lose the jitters.

Certifications
Third-Party TestedNon-GMOcGMP FacilityCOA On Every BatchSuntheanine®Vegan
How to use

1 capsule with coffee, or in the afternoon for calm.

Who it's for

Coffee drinkers, focus stackers, daytime anxiety.

Ingredients

What's inside

Suntheanine® L-theanine.

Sourcing

Where it comes from

Suntheanine — patented enzymatic-fermentation L-theanine from Japan. The only clinically studied form.

Certificate of Analysis · Batch #4563
Supplement facts
Supplement Facts
Serving Size: 1 capsule
Amount / Serving% DV
L-Theanine (Suntheanine®) 200mg
† Daily Value not established.
Pairs well with

Stack it with

Reviews

4.8 out of 5 · 8 verified reviews

Mar 12, 2026
Genuinely clean

Third-party COA on the website sold me. L-Theanine has become part of my morning stack — no chalky aftertaste and no bloat.

Sarah K. · Verified buyer
Feb 28, 2026
Noticeable within a week

I train five days a week and recovery has been sharper. Ingredient list reads like a dietitian wrote it, which is basically the case.

Devon M. · Verified buyer
Feb 04, 2026
Great, wish tub was bigger

Flavor is subtle in the best way. I'd love a family-size option of L-Theanine.

Priya R. · Verified buyer
Jan 22, 2026
Best in class

Tried AG1 and Ritual before this. Rivergrove wins on transparency and taste. Subscribe-and-save makes it a no-brainer.

Marcus T. · Verified buyer
Jan 10, 2026
My dietitian recommended it

She specifically flagged the sourcing standards. I've been on it three months and my labs improved at my last check-in.

Jenna L. · Verified buyer
Dec 18, 2025
Solid daily

Mixes clean in water, no gritty settle. Packaging is a little bulky but I'll take it for the quality.

Owen P. · Verified buyer
Dec 02, 2025
Finally a brand I trust

I'm picky about what goes in my body during pregnancy planning. Rivergrove passed my OB's review.

Camille V. · Verified buyer
Nov 14, 2025
Worth the price

You get what you pay for. L-Theanine is not the cheapest option but the quality is obvious after two weeks.

Ben H. · Verified buyer

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