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Theanine Serene

product on market Tablet or Pill Source Naturals Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 43% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

Magnesium, GABA, and taurine are researched for their roles in supporting relaxation and cognitive function. There is moderate evidence suggesting these ingredients may help modulate stress responses in the brain. Overall, the evidence coverage for this specific profile is limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Theanine Serene
Open Full PDF View on NIH DSLD →
Details

Label Data

2 Tablet(s)
Serving Size
15
Servings
Other Combinations
Product Type
43%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Calories
5 Calorie(s)
Total Carbohydrates
1 Gram(s) (1% DV)
300 mg (75% DV)
Within RDA (0.7× RDA) 316 studies (A:8, B:159)
GABA
500 mg
450 mg
Market median: 500.0mg (180 products) 5 studies (A:0, B:1)
200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)
Market median: 500.0mg (138 products) 2 studies — no high-quality reviews

Other Ingredients

Sorbitol Stearic Acid modified Cellulose Gum Silica
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: 2 tablets daily.

Warnings & Precautions

Warning: If you are pregnant, may become pregnant, or breastfeeding, or taking any medication including antidepressant drugs such as MAOIs, SSRIs, or other neuropsychiatric drugs or supplements such as St. John’s wort, consult your health care professional before using this product.

Excessive consumption may impair ability to drive or operate heavy equipment. Not recommended for consumption with alcoholic beverages.

Do not use if either tamper-evident seal is broken or missing.

Keep out of the reach of children.

Formulation Notes

Theanine Serene contains the amino acid l-theanine, to support relaxation and focused attention, and the calming neurotransmitter GABA. Taurine can support the movement of potassium out of neurons, which may help prevent overexcitation of neurons. It also features magnesium to support muscle and nerve relaxation, and calming holy basil leaf extract to gently soothe away the tension in your body.

Suitable for Vegetarians.

Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

Additional Information

Calm mind & body

Try Theanine Serene to start relaxing today.

SN1774 REV I152-A

Metadata

Product Details

UPC / SKU0 21078 01774 5
DSLD Entry Date2017-08-22
Product TypeOther Combinations
FormTablet or Pill
BrandSource Naturals
DSLD ID77865
Data Updated2026-04-11
Research

Research Evidence

37
Research Sources
53
Avg Quality
22
Rct
10
Systematic Review
3
Meta Analysis
1
Clinical Trial
1
Openfda Safety
B Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials
Systematic Review Nutritional neuroscience 2026 PubMed DOI
B The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
Meta Analysis Sleep medicine reviews 2025 PubMed DOI
B The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
Rct Nutritional neuroscience 2010 PubMed DOI
B Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
Rct Nutrients 2019 PubMed DOI
B The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review
Systematic Review International journal of molecular sciences 2023 PubMed DOI
B Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Meta Analysis Nutrition reviews 2025 PubMed DOI
B Effect of Alpha-S1-Casein Tryptic Hydrolysate and L-Theanine on Poor Sleep Quality: A Double Blind, Randomized Placebo-Controlled Crossover Trial
Rct Nutrients 2022 PubMed DOI
B Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study
Rct Nutritional neuroscience 2025 PubMed DOI
B The combined effects of L-theanine and caffeine on cognitive performance and mood
Rct Nutritional neuroscience 2008 PubMed DOI
B Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis
Meta Analysis Nutrition reviews 2014 PubMed DOI
View all evidence for L Theanine →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.