Verified
“Verified in our ISO certified lab.”
The label prints ISO 17025 certified lab and cGMP certified facility; Nootropics Depot operates both in Tempe, Arizona.
Nootropics Depot Caffeine + L-Theanine Capsules 100/200 mg Review
SAC StudioBest Lab-VerifiedBUY
8.5/10SAC Product Score™
How the score breaks downHide breakdown
SAC Product Score™ — how it breaks down
- Ratio & Dose vs the Trials30%9.0
- Ingredient Sourcing & Form20%7.8
- Testing & Manufacturing20%9.4
- Dosing Flexibility & Practicality15%8.0
- Value15%7.6
Buy it if identity and purity testing matter more to you than caffeine origin
✓ Buy if…
- You want ISO 17025 accredited testing behind every batch
- You want the plain 1:2 pairing with no oils or extras
✗ Skip if…
- You want natural or organic caffeine
- You need a 50 mg step
Read the full analysis
✓ Also buy if…
- You prefer a vendor that manufactures in-house
✗ Also skip if…
- You are price-sensitive
Nootropics Depot manufactures in its own cGMP facility and tests in its own ISO 17025 accredited laboratory, and says so on the label. The panel declares 100 mg caffeine and 200 mg L-theanine per capsule with microcrystalline cellulose, silicon dioxide and vegetable cellulose as other ingredients, one capsule one to two times daily, 60 capsules. The caffeine is not sourced or branded; it is caffeine.
How we built the SAC Product Score™ — 8.5/10
Ratio & Dose vs the Trials30%9/10
100 mg caffeine to 200 mg L-theanine is the trials' 1:2 ratio at double the Owen dose in one capsule.
Ingredient Sourcing & Form20%7.8/10
Unsourced anhydrous caffeine in a vegetable cellulose capsule with microcrystalline cellulose and silicon dioxide; clean but generic.
Testing & Manufacturing20%9.4/10
Manufactured in the vendor's own cGMP facility and verified in its ISO 17025 accredited lab, both printed on the label; the strongest testing credential on the list.
Dosing Flexibility & Practicality15%8/10
One 100 mg capsule per dose, 60 per bottle; the label allows one to two a day.
Value15%7.6/10
About $0.40 per capsule, the highest cost per dose here.
The product at a glance
- Form
- Vegetable cellulose capsule
- Serving
- 1 capsule
- Count
- 60 capsules (60 servings)
- Per serving
- 100 mg caffeine, 200 mg L-theanine
- Other ingredients
- Microcrystalline cellulose, silicon dioxide, vegetable cellulose
- Seals
- cGMP certified facility, ISO 17025 certified lab (label)
- Cost per dose
- ~$0.40 per capsule
Marketing claims vs. reality
Verified
“Dose: 1 capsule, no dosing games.”
One capsule carries the full 100 mg caffeine and 200 mg L-theanine serving on the panel.
Not verified
“Natural caffeine.”
The panel lists caffeine without a source; no natural or organic origin is declared.
What our test actually found
01Testing is the differentiator
An ISO 17025 accreditation means the lab itself is audited for competence, which is a step above a third-party-tested sticker. For a stimulant capsule that is worth something.
02Everything else is ordinary
The formula is the plain pairing with generic caffeine and three standard excipients, at the highest price on the list. You are paying for the lab, not the ingredients.
Pros & cons, no sugar-coating
Pros
- ISO 17025 accredited in-house lab and cGMP facility on the label
- Trials' 1:2 ratio in one capsule
- Vegetable capsule, three excipients
Cons
- Caffeine source not declared
- Highest cost per capsule on the list
- No 50 mg option
The lab-verified pick for buyers who read certificates
If your first question about a stimulant is who tested it and how, Nootropics Depot has the best answer here. If your first question is where the caffeine came from, Zhou and Natural Stacks answer that for less.
Affiliate link — Super Achiever Club earns a small commission at no extra cost to you.
If this doesn’t fit — try these
Zhou Energy + Focus
8.8/10Natural coffee-bean caffeine and 200 mg L-theanine in a vegetable capsule with three excipients, lab-verified in Utah, at thirty-five cents a dose — the cleanest 1:2 capsule on the list.
See it on the list →Natural Stacks Smart Caffeine
8.7/10The same 100/200 pairing with green-coffee-bean caffeine, a third-party-lab-tested mark on the bottle and a QR code to the batch results — the most verifiable label here.
See it on the list →Sports Research L-Theanine + Caffeine
8.6/10Branded AlphaWave L-theanine and organic PurCaf caffeine from green coffee beans in a coconut-MCT softgel — the best-sourced actives on the list, in a form you cannot split.
See it on the list →Sources & further reading
- Einöther SJ, Martens VE, Rycroft JA, De Bruin EA. Appetite. 2010;54(2):406-9.Einöther SJ, Martens VE, Rycroft JA, De Bruin EA · 2010 · Appetite · PMID 20079786
L-theanine and caffeine improve task switching but not intersensory attention or subjective alertness
The theanine-caffeine combination improved task-switching accuracy but did not change intersensory attention or subjective alertness, pointing to a specific attention-control effect.
- Haskell CF, Kennedy DO, Milne AL, Wesnes KA, Scholey AB. Biol Psychol. 2008;77(2):113-22.Haskell CF, Kennedy DO, Milne AL, Wesnes KA, Scholey AB · 2008 · Biological Psychology · PMID 18006208
The effects of L-theanine, caffeine and their combination on cognition and mood
150 mg caffeine with 250 mg L-theanine improved speed and accuracy of rapid visual information processing and reduced susceptibility to distraction versus placebo, while theanine alone slowed some reaction times.