L-Theanine in Neuro Recall: Benefits, Side Effects and Who Should Ask First
Quick answerTea leaves are the natural source of L-theanine, an amino acid. It is 7th of ten items in the Neuro Recall 635 mg blend, so a 2-capsule serving holds up to 90.7 mg. Human research is limited; small studies looked at sleep and calm, not memory. It may add to drowsiness from sedatives, and Memorial Sloan Kettering advises avoiding it in pregnancy and breastfeeding.
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L-theanine on the Neuro Recall label
- Position on the label
- 7 of 10 in the 635 mg blend
- Amount per 2-capsule serving
- Up to 90.7 mg
- Doses used in studies
- Limited human data (MSKCC, L-theanine)
- Share of the studied dose
- Unclear
- Also called
- Amino acid found in tea
L-theanine is the 7th item printed in the WMG-NVT Exclusive Blend. Six items sit above it, from cinnamon to berberine. That order sets a ceiling of 90.7 mg per serving. The true figure could be well below that.
The blend lists it plainly as L-theanine, with no extract ratio. You can see the full panel on the Supplement Facts page.
What is L-theanine, in plain words?
It is an amino acid that occurs naturally in tea leaves. Supplement makers sell it on its own and add it to blends. Most people know it as the tea compound linked to a relaxed feeling.
Memorial Sloan Kettering keeps a public page on it (MSKCC, L-theanine). It says human data are limited. Small studies have looked at sleep and calm, not at memory or dementia.
Neuro Recall also lists a separate green tea extract, standardized to at least 50% EGCG. The label does not say how much L-theanine, if any, that extract adds.
L-theanine benefits: what people hear vs. what the sources say
Online claims often run ahead of the research. The table pairs each common promise with what our source actually reports. Use it as a talking sheet at a doctor visit.
| What people hear | What the source says | What it means for Neuro Recall | Source |
|---|---|---|---|
| Helps you relax | Small studies looked at calm | Data are limited; not a treatment for anxiety | (MSKCC, L-theanine) |
| Helps you sleep | Small studies looked at sleep | Not a sleeping pill; may add to sedatives | (MSKCC, L-theanine) |
| Sharpens memory | Not shown in our sources | Not the memory part of Neuro Recall | (MSKCC, L-theanine) |
| Safe for everyone | Avoid in pregnancy and breastfeeding | Ask first if you take drowsy-making medicine | (MSKCC, L-theanine) |
| A big dose per serving | Up to 90.7 mg by label order | Real amount not printed | (21 CFR 101.36) |
How much L-theanine can a Neuro Recall serving hold?
At most 90.7 mg. Federal rules require blend items to be listed from heaviest to lightest (21 CFR 101.36). With ten items sharing 635 mg, the 7th one cannot weigh more than 635 divided by 7.
That is a ceiling, not a promise. If cinnamon or ginkgo take up most of the blend, L-theanine could be a few milligrams.
- 7thposition of 10 in the blend
- 90.7 mgthe most it can weigh
- 635 mgtotal blend per serving
- Cinnamon Bark Extract At least 63.5 mg
- Ginkgo Biloba Leaf Extract Up to 317.5 mg
- Bilberry Fruit Extract Up to 211.7 mg
- Bacopa Monnieri Extract Up to 158.8 mg
- Green Tea Leaf Extract Up to 127 mg
- Berberine HCl Up to 105.8 mg
- L-Theanine Up to 90.7 mg
- Alpha Lipoic Acid Up to 79.4 mg
- GPC Choline (Alpha-GPC) Up to 70.6 mg
- Lutein & Zeaxanthin Up to 63.5 mg
Drowsiness and other L-theanine cautions
The main one to know is extra drowsiness. Memorial Sloan Kettering says it may add to the effects of sedatives. On its own, our source does not list a long set of problems, partly because the research is small.
Extra sleepiness
Most likely if you also take sleep, anxiety or drowsy-type allergy medicine. Skip driving until you know how you react.
Pregnancy and nursing
Avoid it. Memorial Sloan Kettering advises against use, and the Neuro Recall label says do not use if pregnant or nursing.
Stomach upset
Not tied to L-theanine in our source. In this formula, the magnesium oxide is the more likely cause of loose stools.
Our side effects page covers every item in the formula, not just this one.
Which medicines should you ask about first?
Any medicine that makes you drowsy. Bring the bottle, or a photo of the label, to the pharmacy counter. The questions below make the talk quick.
| If you take | Examples to mention | A question to ask |
|---|---|---|
| Sleep aids | Prescription or over-the-counter sleep pills | Could the two together make me too drowsy at night or the next morning? |
| Anxiety medicine | Medicines that calm or cause drowsiness | Should I avoid L-theanine with this, or space the doses? |
| Pain medicine | Some pain pills cause drowsiness | Is it safe to drive while I take both? |
| Allergy or cold pills | Drowsy-type antihistamines | Does this count as a sedative for me? |
| Alcohol | Evening drinks add to sleepiness | How much, if any, is wise with this product? |
Check the whole label, not one ingredient
L-theanine is not the only part of Neuro Recall with a medicine caution. With blood thinners, ginkgo may add to bleeding risk (NCCIH, Ginkgo). Chromium, berberine and alpha lipoic acid may lower blood sugar.
Honest note: is L-theanine a reason to choose this product?
Probably not on its own. It shares 635 mg with nine other items, and its share is capped well below 100 mg. The research behind it is about calm and sleep, which is not what the product name suggests.
The whole formula has no published trial. Ginkgo, the most familiar herb in it, did not lower dementia rates in a six-year study (Snitz et al., JAMA 2009). You can read how the parts fit together on how it works.
The plus side is clarity. The label names L-theanine, so you can ask a pharmacist about it before the first dose.
A caregiver checklist for a parent on evening medicines
Many older adults take something at night for sleep, pain or allergies. That is where L-theanine deserves a second look. This list helps an adult child set things up safely.
Before and during the first week
- Write down every medicine and supplement your parent takes, with the time of day
- Circle any that say “may cause drowsiness” on the pharmacy label
- Show the list and the Neuro Recall label to the pharmacist before the first capsule
- If the doctor agrees, give the capsules in the morning, away from bedtime pills
- Watch the first week for extra sleepiness, unsteady walking or confusion
- Stop and call the doctor if anything new appears; call 911 for sudden confusion or trouble speaking
Sudden confusion is never a supplement side effect to wait out. It can be a sign of stroke (CDC, Stroke signs). The caregiver memory guide has more on spotting changes early.
What to note in the first two weeks
- 01
Time of each dose
Morning with breakfast is easy to track. Write the time so you can link any drowsiness to it.
- 02
Sleepiness during the day
A short yes or no each afternoon is enough. Patterns matter more than single days.
- 03
Falls or near-falls
Drowsiness raises fall risk in older adults. Any fall is a reason to call the doctor.
- 04
Other changes
Stomach upset, bruising or shakiness can come from other parts of the formula. Note them too.
The how to use page has a printable log table you can copy. For the other studied herbs, see bacopa monnieri and ginkgo biloba.
L-theanine FAQ: questions people search
What does L-theanine do?
It is an amino acid from tea that small studies have looked at for sleep and a calm mood. Memorial Sloan Kettering says the human data are limited, so its effects are not well pinned down.
What are the benefits of L-theanine?
No benefit is firmly proven. The research on people is small, and it centers on relaxation and sleep rather than memory or focus.
Can L-theanine make me groggy or cause problems?
Few side effects are described in our sources. The main caution is that it may add to the drowsiness caused by sedatives, sleep aids or similar medicines.
Does L-theanine make you sleepy?
It is not a sleeping pill, but it may add to sleepiness when taken with sedatives. If you feel drowsy after starting a product with it, do not drive until you know how it affects you.
Can I take L-theanine with anxiety or sleep medicine?
Ask your doctor or pharmacist first. Memorial Sloan Kettering says it may add to the effect of sedatives, and many anxiety and sleep medicines cause drowsiness.
What is the L-theanine cap in two Neuro Recall capsules?
Up to 90.7 mg per 2-capsule serving. It is 7th of ten items in a 635 mg blend, and the exact amount is not printed on the label.
Is L-theanine safe during pregnancy?
Memorial Sloan Kettering advises avoiding it while pregnant or breastfeeding. The Neuro Recall label also says not to use the product if you are pregnant or nursing.
Does L-theanine help memory?
Our sources do not show that it does. It was studied mostly for sleep and calm, so it is not the memory part of the formula.
Are L-theanine and green tea extract the same thing?
No. L-theanine is one amino acid found in tea, while green tea extract is a broader extract. Neuro Recall lists both as separate items, and its green tea extract is standardized to EGCG.
Can older adults take L-theanine?
The label is for adults 18 and over and sets no upper age. Older adults on several medicines, especially ones that cause drowsiness, should check with a doctor first.
Ready to try Neuro Recall?
Two capsules once a day, a full printed label, and the price shown on the checkout before you pay. Buying for a parent? Show the label to their doctor or pharmacist first.
