Essentials, Caffeine + L-Theanine, 180 Capsules

Customer Ratings & Reviews

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4.6

Based on 73 ratings

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What customers say

(72)

iHerb customer

Silver

Posted on Sep 7, 2025

Australia

101

Great

Verified purchase

I feel less jittery taking this than if I drank tea or coffee (I used to be big on green tea). It's easier to control the dose.

iHerb customer

Posted on Aug 29, 2025

Saudi Arabia

good value for price

Verified purchase

great size for the price. cost effective. as usual i can depend in this for energy and clarity boost. few of the capsules had unpleasant taste but most were ok. nothing wrong with quality. i wished the dosage was 100mg caffeine and 200mg theanine but this one acceptable.

iHerb customer

Posted on Aug 13, 2025

Saudi Arabia

keep awake

Verified purchase

this tablet Will keep you awake and focused, best quality i believe, with no taste to be mentioned, and high efficiency with adorable dosage and good package, benefit is very good

iHerb customer

Posted on Oct 26, 2025

Israel

Seems Ok, but not sure about it's absorbency and/or effectiveness

Verified purchase

As a person that 1 espresso makes him 'jumpy' and alert, and since espresso has about 40mg of caffeine, this 100mg should be plenty, but it doesn't do much more than 1 espresso cup which is weird since it's double the amount of caffeine. but maybe it's the Theanine inside that's 'controlling' the outcome. Anyway, Surely not a bad product, but not extraordinary. ok for the price.

TomisMatthaiou

Silver

Posted on Aug 30, 2025

Cyprus

151

very good

Verified purchase

high quality supplement. Very good package size and dosage. Caffeine is one of the best and effective pre workout supplements with benefit to body composition when comparing in routine with diet and training for energy balance

Irina

Posted on Dec 21, 2024

Moldova, Republic of

127

Very energising!

Verified purchase

I bought this caffeine supplement as i have allergy on green/black tea since i had a coronovirus.So the only help for me was this supplement.I don't use it everyday but when i take it the result is the energy to all day and also it helps me sometimes when i have headaches.The efficiency and the dosage is good for me.The package is good because it has 180 capsules.

iHerb customer

Silver

Posted on Apr 13, 2026

Saudi Arabia

299

Verified purchase

very good with a lot of benefits and fast shipping

iHerb customer

Silver

Posted on Jan 13, 2025

166

211

Surprisingly Amazing

Verified purchase

I've was told to stay away from all things caffeine-containing (tea/coffee/chocolate/macha etc) since I was diagnosed with a methylation disorder 13 years ago, and then again with MCAS 5 years ago. I've stuck to that advice religiously until I recently became so desperate to find a solution to the extreme drowsiness and brain fog I've been experiencing as a double whammy from situational depression and chronic anaemia. I started tentatively researching caffeine and discovered a lot of positive talk about the efficacy and side-effect mitigation of caffeine+theanine together. So I found this one on iHerb and was brave enough to try it thanks to some super helpful accounts left by reviewers (thank you!). This has change my life. From within an hour of getting up every day my body would be trying to shutdown and sleep. I'd be fighting the incredible urge to nod off at the computer at 10am. Nod off while driving, just going 10mins down the road to get groceries. Things were really hard and felt really bleak. I was SO careful when I first tried taking this stuff - I didn't want to at all jeopardise my methylation balance or trigger MCAS symptoms. I started off by taking a 1/4 capsule in the morning with my other supplements. I didn't notice much change, except maybe a tiny bit more lucidity? But certainly nothing detrimental happened. So by midday I was brave enough to take another 1/4 and what followed was the most productive afternoon I've had in about 6 months. And with no noticeable side effects. I've been taking 1/2 capsule every morning since. About 2.5 weeks now. The awful drowsiness disappeared after about 36 hours of the first day, and as the next few days progressed I found the worst of the fatigue and feelings of darkness/hopelessness/uselessness started to give way to little moments of inspiration, creative thoughts and interest in things... those are feelings lost to me for months. FYI, as part of my long term supplement routine I already was taking Alpha GPC, Phosphatidylserine, Dopa Mucuna and a number of amino acids that assist with neurotransmitter balance. All of that was failing me though, during this particularly difficult time, until I added this stuff. I'm so incredibly grateful that this product exists - and for those who shared their experiences taking it. For now at least, it really is changing my life.

iHerb customer

Posted on May 14, 2026

Israel

caffeine and L-Theanine

Verified purchase

the caffeine and L-Theanine product is highly recommended, I have used it for several days and think its one of the best products on the platform

Arthur

Posted on Mar 29, 2026

France

Very practical

Verified purchase

Practical dose of caffeine when on the move. The theanine brings a much more balanced and grounded effect to the caffeine, also making the effect felt longer in my body. Great for concentration, physical work or just simply staying awake when needed

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