Molecular identity
Suntheanine
- Formula
- C₇H₁₄N₂O₃
- g/mol
- 174.20
- CAS
- 3081-61-6
Strong evidence
Strong evidence
Repeated randomised human trials, and the effect holds up when the studies are pooled. This is as good as supplement evidence gets.
L-Theanine
Suntheanine, 200 mg엘테아닌
Supports a relaxed, focused state without drowsiness.
200 mg
per capsule — the whole formula
S$0.60
per day, no bundle math
Strong evidence
graded honestly, weak included
2026-08-11
lot KD-2609B tested
What it is
L-Theanine is an amino acid from green tea. Suntheanine is the pure L-isomer produced by fermentation, the form used in most human trials.
How to take
One capsule with water, evening or during focused work.
Supplier
Taiyo (Suntheanine)
Made at
GMP facility, Cheongju, Korea
Inside this capsule
This capsule
L-Theanine
Suntheanine · 200 mg
One ingredient. The dose on the label is the dose in your hand, and the lot number traces it back to one supplier: Taiyo (Suntheanine).
A typical blend capsule
ingredient?dose?ingredient?dose?ingredient?dose?ingredient?dose?ingredient?dose?ingredient?…
“Proprietary blend, 1,200 mg” — many names, one number, no way to know how much of anything you took, or what competes with what inside.
On the evidence
Trials link L-theanine with alpha-wave activity and subjective relaxation. Function claim only.
Where it sits on our scale
Traditional use
Long use, thin trials — we say so
Moderate evidence
Human trials, small or mixed
● Strong evidence
Repeated randomised human trials
Every ingredient in the catalogue carries one of these three grades — including the ones we grade down. A scale you never see the bottom of is not a scale.
When you’d notice
Measured the same day it is taken
Same day → settles by 2 weeks
day 11w2w4w8w12w26w
Calmer within the hour on the day you take it; sleep quality is what takes a couple of weeks to judge.
Source: NIH ODS-indexed EEG and self-report studies dosing 200 mg once
This lot’s certificate이 로트의 성적서
- Lot
- KD-2609B
- Tested
- 2026-08-11
- Lead
- <0.005 ppm
- Cadmium
- <0.001 ppm
- Allergens, 9 panel
- Not detected
Works in 2 sets
Usually noticeable
1–2 weeks
From the consultation card that recommends it — not a promise, a typical window.
Reviews
4.54 reviews
- ★★★★★Quietly good
Nothing flashy. Ordered, arrived in five days, matches the label, certificate loads. That's all I ask and almost nobody does it.
Anong P. · SG · 2026-08-21
- ★★★★★Finally, one thing per capsule
I've read too many labels that say 'proprietary blend 1,200mg'. Here it's one ingredient, one dose, printed. Bought two singles instead of my old multi.
Daniel O. · SG · 2026-08-11
- ★★★★★Gift link surprised my mum
Sent the set to my mother through the gift link and she could see exactly what was in it before accepting. She's picky — she approved.
Mei Xin O. · SG · 2026-07-29
- ★★★★★Solid, would like bigger packs
30 days per pack is tidy but I'd buy 90 if it existed. Capsule quality consistent across two orders, no smell, no clumping.
Hafiz I. · MY · 2026-07-24
We show every rating including low ones, and never gate reviews on score.
This product is a health supplement, not a medicine. It is not intended to diagnose, treat, cure or prevent any disease. Statements describe nutritional or traditional function only.