








💼 Elevate your focus and calm—because your busy mind deserves the best
NatureBell’s Double Strength L-Theanine offers a potent 400mg dose per serving in a massive 400-capsule supply. This non-GMO, allergen-free supplement supports daily calmness and sustained focus without sedation, backed by 3rd party lab testing for purity and potency. Ideal for professionals seeking natural stress relief and balanced mental clarity, it pairs seamlessly with caffeine to smooth jitters and enhance productivity.










| ASIN | B0DDCW97QV |
| Best Sellers Rank | #28,318 in Health & Household ( See Top 100 in Health & Household ) #427 in Amino Acid Nutritional Supplements |
| Customer Reviews | 4.6 4.6 out of 5 stars (434) |
| Date First Available | August 16, 2024 |
| Manufacturer | NatureBell |
| Package Dimensions | 6.22 x 3.19 x 3.11 inches; 4 ounces |
J**D
Calm Focus, Big Supply, Real Results
⭐️⭐️⭐️⭐️⭐️ Calm Focus, Big Supply, Real Results The Double Strength L-Theanine supplement is an excellent option if you want maximum potency and long-term value. With 400 mg per serving and 400 capsules, this isn’t just a supplement — it’s a serious stock-up solution for daily mental balance. I take one capsule when I need to dial in my focus without the caffeine edge, or in the evening when my mind needs to unwind without feeling sleepy. The effect is clean, subtle, and natural: less mental noise, smoother stress response, and a relaxed clarity that lets you stay productive without feeling wired. Unlike many lower-dose options, the 400 mg strength actually feels meaningful — especially for high-stress days or pairing with coffee to soften jitters while keeping alertness. No strange taste, no stomach upset, no crash. Just consistent cognitive support that feels gentle and effective. One of the biggest wins is the capsule count. With 400 in the bottle, I don’t have to reorder every month, which saves money and hassle. Packaging was secure and freshness intact. Great for anyone serious about mood support and nootropic supplementation. Top benefits I’ve noticed: 🧘 Reduced stress, no drowsy feeling 🧠 Better balanced focus and calm attention ☕ Helps smooth caffeine side effects 🌙 Supports relaxation at night 📆 Huge supply lasts a long time Pros: ✔ 400 mg = high, effective dosage ✔ 400 capsules = unbeatable bulk value ✔ Supports calm focus without sedation ✔ No bad aftertaste or side effects ✔ Great for coffee pairing or evening use ✔ Ideal for long-term daily routines Cons: • Because it’s higher potency, beginners may want to start slowly to find their ideal dose — but if you already use L-Theanine, this strength is a total win. If you want a strong, clean, and reliable nootropic for calm focus and stress support, this is it. Incredible value, great potency, and smooth results that genuinely improve the day. I’ll keep this in my routine! 👏 Double Strength L Theanine 400mg, 400 Capsules
B**N
Must have
This is a wonderful best product ever. This helps my husband and I to sleep way better. We both get much needed sleep. The size is nice. This does help improve the mood. No side effects for us both. This is so gentle on both of our stomachs. No taste. This is so easy to take. I take 2 once a day. My wife takes 2 of these every night. We will keep ordering this wonderful product.
D**L
Good value
Product is as described
A**R
works fine
Helps some with sleep
P**T
Great vitamin
Great for a good night sleep.
S**N
happy customer
excellent price, great product and bought a couple timesbuy again
S**S
Product is good, but there's a deception here...
The product is fine, but they advertise or promote by deceptive means. They make it out, very subtly, as if each capsule is 400 mg. It *is not*. Each capsule is 200mg, for a total per serving (one serving is two capsules) of 400mg. This makes it comparable with the Horbach, and other brands that use the 200mg per capsule, with two capsules being one serving. Is it a good deal? Sure, it is. But it *not* a better than price than some of the other brands using the same standard and measurement. If it weren't for this dubious advertising, I'd give this product five stars. The product is good, but just be honest with people.
R**S
Beautiful
I've been testing these products for weeks and they have immediate effects.
E**O
Tarda en servir el efecto. Quizá un mes.
Trustpilot
Hace 4 días
Hace 1 mes