What’s inside this formula?
Natural Factors’s Mental Calmness L-Theanine — 125 mg is listed here in the theanine collection. This article looks at the selected 60 vegetarian capsules pack, then puts its ingredients into context.
Each capsule supplies 125 mg Suntheanine L-theanine. The Canadian manufacturer daily direction is 2 capsules, giving 250 mg.
Check the original label ↗L-theanine is an amino acid found in tea and also sold as a separate supplement. Small human trials have examined stress-related symptoms and aspects of sleep. Tea, isolated theanine and theanine combined with caffeine are different interventions, so the complete formula matters when interpreting research or deciding what effect to expect.
The pack details above come from the manufacturer. Ingredient research below does not establish the effects of this exact product or independently verify its contents.
A single amino-acid derivative
The active ingredient is 125 mg Suntheanine L-theanine. The 60-capsule bottle is distinct from this brand’s 100 mg chewable and 200 mg products.
Capsule count and label direction
Two capsules supply the manufacturer’s stated 250 mg daily amount, making 30 such portions per bottle. The actual photographed pack retains the Mental Calmness branding.
Keep claims proportionate
Relaxation is the manufacturer’s positioning. The label information does not prove that this exact product treats anxiety, depression or insomnia, and it does not establish suitability for an individual.
Where might it be useful?
Possible stress-related effects
A small randomized study reported improvement in some stress-related measures after short-term L-theanine use.
Possible sleep-related effects
The same research explored sleep measures, providing preliminary findings rather than a guaranteed sleep benefit.
What the research can — and cannot — tell us
The cited trial was small and short, with results that need replication in broader populations. It does not establish treatment of anxiety disorders or chronic insomnia. Effects of a specific theanine preparation should not be assumed for every capsule, blend or drink, particularly when caffeine is added.
What deserves your attention?
Not a replacement for assessment or treatment of anxiety or sleep disorders. Review suitability with a professional when pregnant, breastfeeding, using medicines or treating a medical condition.
Suitability comes before strength
Check blends for caffeine and other sleep or mood ingredients. Discuss persistent insomnia, anxiety, pregnancy or medicine use with a clinician. Avoid assuming that a supplement will be effective or appropriate simply because the ingredient occurs in tea.
Dietary details for this product
Vegan The manufacturer explicitly declares the complete formula vegetarian/vegan; it lists a cellulose capsule, rice powder, vegetable magnesium stearate and silica.
A dietary label and an allergy assessment answer different questions. Check every ingredient, the capsule or softgel materials and the allergen statement on the pack you receive. If you take medicines, have a health condition, are pregnant or are choosing for a child, discuss the full formula with a qualified clinician.
Make the comparison meaningful.
- Match the exact version.Look for Natural Factors · Mental Calmness L-Theanine — 125 mg and the 60 vegetarian capsules pack. A similar name or bottle can contain a different strength, blend or serving.
- Compare like with like.Read the serving size alongside the active ingredient amount. Capsule count, compound weight and total blend weight can describe different things. Use the label notes above to see what matters for this formula.
- Check the seller and final cost.Review seller identity, expiry, batch details and any Indian import information. Compare the final delivered price only after matching the formula. Prices and stock are checked on the retailer’s site.
Keep the label beside the decision.
Open the complete product profile for its source, dietary notes and available shopping destination.
Is this an endorsement or a medical recommendation?
No. This is an editorial guide to a selected product and its ingredient context. We have not independently tested this bottle or established a clinical benefit for this exact formula. A product’s inclusion is not a recommendation that everyone should take it.
Does Proof & Price earn from shopping links?
Some product-profile links are paid links and are labelled. As an Amazon Associate we earn from qualifying purchases. Manufacturer source links are provided for checking the label. Read our affiliate disclosure.
Read, check, decide.
Product label reviewed 2026-10-29. Ingredient context reviewed 2026-10-26. This article has not received independent clinical review. Packaging and formulas can change; the current pack takes precedence.
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