Nootropics Depot Caffeine + L-Theanine Capsules 100/200 mg Review
#4 of 8 · Best Lab-Verified✓ Label verified · Supplement Facts read Sep 20, 2026Real retailer photo, cut out. Label unedited.
Buy it if identity and purity testing matter more to you than caffeine origin. No brand on this list backs its testing with an accredited in-house lab the way Nootropics Depot does.
$23-25~$0.40 per capsule (100 mg caffeine + 200 mg theanine)
Why It Scores 8.5 — And The Label Line Behind Each Number
Ratio & Dose vs the Trials
30% of score100 mg caffeine to 200 mg L-theanine is the trials' 1:2 ratio at double the Owen dose in one capsule.
- Per serving
- 100 mg caffeine, 200 mg L-theanine
Ingredient Sourcing & Form
20% of scoreUnsourced anhydrous caffeine in a vegetable cellulose capsule with microcrystalline cellulose and silicon dioxide; clean but generic.
- Form
- Vegetable cellulose capsule
- Other ingredients
- Microcrystalline cellulose, silicon dioxide, vegetable cellulose
Testing & Manufacturing
20% of scoreManufactured 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.
- Seals
- cGMP certified facility, ISO 17025 certified lab (label)
Dosing Flexibility & Practicality
15% of scoreOne 100 mg capsule per dose, 60 per bottle; the label allows one to two a day.
Value
15% of scoreAbout $0.40 per capsule, the highest cost per dose here.
- Serving
- 1 capsule
- Count
- 60 capsules (60 servings)
- Cost per dose
- ~$0.40 per capsule
Label verified. Every figure read from the Supplement Facts photo, Sep 20, 2026.
Marketing Claims Vs. Reality
Verified in our ISO certified lab.
The label prints ISO 17025 certified lab and cGMP certified facility; Nootropics Depot operates both in Tempe, Arizona.
Dose: 1 capsule, no dosing games.
One capsule carries the full 100 mg caffeine and 200 mg L-theanine serving on the panel.
Natural caffeine.
The panel lists caffeine without a source; no natural or organic origin is declared.
What Our Test Actually Found
Testing 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.
Everything 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.
Full analysis: all pros & cons (6), buy if / skip if
- ISO 17025 accredited in-house lab and cGMP facility on the label
- Trials' 1:2 ratio in one capsule
- Vegetable capsule, three excipients
- Caffeine source not declared
- Highest cost per capsule on the list
- No 50 mg option
- You want ISO 17025 accredited testing behind every batch
- You want the plain 1:2 pairing with no oils or extras
- You prefer a vendor that manufactures in-house
- You want natural or organic caffeine
- You need a 50 mg step
- You are price-sensitive
No brand on this list backs its testing with an accredited in-house lab the way Nootropics Depot does. The formula is the plain studied pairing with three excipients. What it lacks is a natural caffeine source or any branded material, and at around forty cents a capsule it is the most expensive of the eight.
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.
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.
If This Doesn’t Fit — Try These
01Zhou Energy + Focus
Natural caffeine, the studied ratio, a vegan capsule and almost nothing else.
02Natural Stacks
The same pairing and dose as the winner with the best testing transparency on the list.
03Sports Research
If you want to know exactly which caffeine and which theanine you are taking, this is the only product here that names both.
Quick Answers
Where is Nootropics Depot Caffeine + L-Theanine made?
In the vendor's own cGMP certified facility in Tempe, Arizona, and tested in its ISO 17025 certified laboratory, per the label.
How many capsules a day?
The label says one capsule one to two times daily. Each is 100 mg caffeine and 200 mg L-theanine, so two capsules is 200 mg caffeine, about two strong coffees.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Einöther SJ, Martens VE, Rycroft JA, De Bruin EA. Appetite. 2010;54(2):406-9. 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.
- [2] Haskell CF, Kennedy DO, Milne AL, Wesnes KA, Scholey AB. Biol Psychol. 2008;77(2):113-22. 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.
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