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L Theanine vs L Arginine: Which Is in VapoCept?
L-theanine and L-arginine are different amino acids, and only arginine is on the VapoCept panel, at 200 mg plus a separate 200 mg arginine AKG line. We gathered no sources on theanine, so we make no claim about it. For arginine, studies use 4,000 to 24,000 mg a day.
Written by the VapoCept label deskUpdated · 4 min read
Side by side01
Is L-theanine the same as L-arginine?
No. They are different molecules with different names and different research.
| Question | L-theanine | L-arginine |
|---|---|---|
| On the VapoCept panel? | No | Yes, 200 mg plus 200 mg AKG line |
| Sources we gathered | None | Safety and blood pressure |
| Studied range we cite | None | 4,000 to 24,000 mg a day |
An amino acid best known from tea. We can say nothing more about it with sources.
The evidence02
Which one has more evidence for thinking?
Neither has a cited trial in healthy adults for what a bottle might claim.
One small trial gave 3.32 g of arginine a day for 4 weeks to frail older adults with high blood pressure and reported a thinking-test difference (Mone 2022, L-arginine in frail hypertensive older adults). That dose is about 16 times 200 mg. We gathered no theanine trial to compare.
Label amount vs research amount, log scale
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L-Arginine (base)
5% of the low study amount200 mg4,000 to 24,000 mg a day in blood pressure trials; 2,000 to 20,000 mg in exercise reviews (Dong 2011, Oral L-arginine and blood pressure meta-analysis)
-
L-Arginine AKG extract
5% of the low study amount200 mg4,000 to 24,000 mg a day, the same arginine range; the AKG share of the 200 mg is not stated (Dong 2011, Oral L-arginine and blood pressure meta-analysis)
-
L-Citrulline HCl
1.7% of the low study amount100 mg6,000 to 8,000 mg a day (blood pressure and exercise studies) (Citrulline, perceived exertion and soreness meta-analysis (2020))
-
L-Citrulline Malate
1.7% of the low study amount100 mg6,000 to 8,000 mg a day; 8,000 mg of citrulline malate is the usual exercise amount (Citrulline, perceived exertion and soreness meta-analysis (2020))
-
Beta-Alanine
about 1% of the low study amount40 mg4,000 to 6,000 mg a day for weeks in exercise studies (NIH ODS, Exercise and athletic performance (health professional))
-
Niacin
47% of the adult RDA7.5 mgRDA 16 mg NE for men (14 for women); upper limit 35 mg a day from supplements (NIH ODS, Niacin (health professional))
-
Calcium
1.8% of the adult RDA18 mgRDA 1,000 mg a day for adults 19 to 50 (NIH ODS, Calcium (health professional))
Cyan marker: the amount in the brand's panel, as listed. Graphite bar: the range used in research (amber bar for the RDA up to the upper limit). Each step to the right is ten times more. A studied dose says what was tested, not what works for you, and no study tested VapoCept.
Combining them03
Can you take L-theanine and L-arginine together?
We have no source on the pair, so ask a pharmacist.
The arginine cautions apply: Mayo Clinic says it might lower blood pressure and is not recommended after a recent heart attack (Mayo Clinic, L-arginine).
VapoCept: 30 capsules, 30-day bottleOne capsule a day · 2, 3 or 6 bottles · $49 to $79 a bottle per the brand information, confirm at checkout
See packsOn the panel04
What is actually in the VapoCept panel?
Seven lines, and theanine is not one of them.
See the ingredients page for all seven lines and the supplement facts page for the panel. If you choose to try the capsules, the packs are below.
90-day supply
3 bottles: 90 days
$69a bottle · $207 for 3 · per the brand information
Ships from the U.S. · 60-day guarantee per the sales page
Order 3 bottles
180-day supply
6 bottles: 180 days
$49a bottle · $294 for 6 · per the brand information
Ships from the U.S. · 60-day guarantee per the sales page
Order 6 bottlesPrices follow the brand information; confirm the live price at checkout. A 2-bottle pack is also offered. Check your medicines with your doctor or pharmacist before you order.
FAQ05
VapoCept questions people ask
Is L-theanine in VapoCept?
No. The brand's panel lists niacin, calcium, L-arginine, L-arginine AKG, L-citrulline HCl, L-citrulline malate and beta-alanine. L-theanine is not on it. Check your bottle, since we have only the panel as listed in the brand's information.
Is L-arginine better than L-theanine?
We cannot rank them. We gathered no sources on theanine, and no cited study shows arginine improves memory or focus in healthy adults. Arginine has safety cautions with blood pressure medicines and after a heart attack that you should weigh with a clinician.
Do L-theanine and L-arginine work the same way?
No. Arginine is the body's raw material for nitric oxide, a proposed route studied for blood pressure and exercise. We gathered no sources on how theanine acts, so we do not describe it. They are separate compounds with separate research.
Sources (7)
- L-Arginine Improves Cognitive Impairment in Hypertensive Frail Older AdultsMone P, Pansini A, Jankauskas SS, et al. Frontiers in Cardiovascular Medicine 2022;9, 2022
- L-arginineMayo Clinic, 2026
- Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trialsDong JY, et al. American Heart Journal 2011;162(6):959-965 (authors from general knowledge; the fetched page showed only the title, journal and results), 2011
- Effect of citrulline on post-exercise rating of perceived exertion, muscle soreness, and blood lactate levels: A systematic review and meta-analysisJournal of Sport and Health Science 2020 (authors not shown on the fetched PubMed page; Rhim HC et al. from general knowledge), 2020
- Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
- Niacin: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2022
- Calcium: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
Who wrote this06
Written and reviewed by
Pages built from the brand information, the brand's images and linked NIH, FDA, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site of Vapocepts, the U.S. stocking partner for VapoCept. It is not the manufacturer and it is not the sales page. We earn money when you buy through our order links.
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