Natural Factors Natural Factors - Magnesium Bisglycinate Plus L-Theanine - 250 mg, 90 vcaps
Natural Factors Magnesium Bisglycinate Plus L-Theanine - Combines 40 mg of the essential mineral magnesium with 250 mg of the amino acid L-theanine to temporarily promote relaxation without causing drowsiness. This non-GMO formula features magnesium bisglycinate, which is easy on the stomach and does not rely on stomach acid for absorption. Magnesium is an essential mineral required as an enzyme cofactor in more than 300 metabolic reactions throughout the body. It helps maintain healthy bones, teeth, muscles, and nerves and is needed to metabolize nutrients into energy. L-theanine is found naturally in green tea and has long been known to promote a sense of calm in tea drinkers. It provides a noticeable effect within 30–40 minutes of supplementation, helping to relieve symptoms of occasional and daily stress, calm the nerves, and focus the mind.
Price
Regular Canadian retail price: $19.98 CAD. Price Vault members pay below retail on this product. Member pricing is private and shown after a free opt-in, with no membership fee, no minimum order and no subscription.
In stock. Free shipping across Canada on orders over $89, flat $9.95 under that. 30 days to request a return, with return shipping paid by the customer. Ships from Victoria, BC.
Why people keep reordering it
- Adaptogen support
- Herbs traditionally used to help the body adapt to everyday stress.
- Steady energy
- Supports balanced energy without the spike and the crash.
- Calm focus
- Helps you stay even through demanding days.
Best suited to: wants a full theanine dose in one capsule, gets jittery on coffee, already takes magnesium separately.
What the research supports
One capsule is 250 mg of L-theanine, with 40 mg of magnesium riding along. Ninety capsules make about a three-month supply.
Theanine trials use 100 to 400 mg; most run near 200 mg.
- Stress (evidence: moderate, from randomized controlled trial)
- L-theanine crosses into the brain and raises calming alpha brain waves within about 40 minutes. This capsule's 250 mg sits inside the dose range trials use for calm under pressure.
- Focus (evidence: moderate, from randomized controlled trial)
- Paired with caffeine, theanine blunts the jittery edge while caffeine still sharpens attention, which is why trials combining the two report fewer errors on focus tasks than caffeine alone.
- Sleep (evidence: mixed, from randomized controlled trial)
- At 200 mg, theanine trials show a modest rise in rated sleep quality without shortening the time it takes to fall asleep, and the results are inconsistent.
Read the literature: Stress on PubMed, Focus on PubMed, Sleep on PubMed.
Is it right for you
Worth it if
- Wants a full theanine dose in one capsule
- 250 mg in a single swallow is above the 200 mg used in most acute stress trials, with no capsule counting to do.
- Gets jittery on coffee
- 250 mg matches the theanine dose paired with caffeine in attention trials, where it cut errors without dulling alertness.
- Already takes magnesium separately
- The 40 mg here is small enough that it will not meaningfully stack on top of a proper magnesium dose.
Look elsewhere if
- Anyone buying this as their magnesium
- 40 mg per capsule is about a tenth of an adult daily requirement. A bisglycinate at 200 to 400 mg elemental per serving is what actually covers magnesium.
- Someone who wants both actives properly dosed
- The 125 mg theanine version of this pairing carries 100 mg of magnesium per capsule, so two of those give 250 mg theanine and 200 mg magnesium together.
- Wants theanine as cheaply as possible
- A plain 250 mg L-theanine capsule gives the identical theanine dose with nothing extra to pay for.
What to expect
The theanine is noticeable within 30 to 40 minutes as mental tension easing, and it tapers over the following few hours. The 40 mg of magnesium contributes nothing you will feel. Nothing here accumulates, so judge the product by how the hour after a capsule goes rather than by week three.
How it compares
- Compared with a plain 250 mg L-theanine capsule
- The same theanine plus 40 mg of well-absorbed bisglycinate magnesium that a single-ingredient capsule does not carry. The tradeoff: You are paying for magnesium at a dose too small to function as a magnesium supplement.
- Compared with the 125 mg theanine version of the same formula
- Double the theanine per capsule, so one capsule is already a full relaxation dose instead of two. The tradeoff: 40 mg of magnesium against 100 mg, which turns the mineral side into a footnote.
Product details
- Medicinal ingredients
- L-theanine, Magnesium (bisglycinate)
- Ingredient form
- vcaps
- Strength
- 250 mg
- Servings per container
- 90
- Suggested use
- 1 capsule daily or as directed by a health care practitioner.
- Country of manufacture
- Canada
- Independent testing
- ISURA
- Certifications
- Non-GMO, Made in Canada
- Storage
- Store in a cool, dry place
- Brand
- Natural Factors
How to take it
1 capsule daily or as directed by a health care practitioner.
- Store in a cool, dry place away from direct light.
- Keep out of reach of children.
- Consult a practitioner if you are pregnant, nursing or on medication.
Ingredients
Each vegetarian capsule contains
- L-theanine
- 250 mg
- Magnesium (bisglycinate)
- 40 mg
Non-medicinal ingredients
Vegetarian capsule (carbohydrate gum [cellulose], purified water), rice flour, vegetable grade magnesium stearate (lubricant), stearic acid, silica.
Free from
Contains no artificial colours, preservatives, or sweeteners; no dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, animal products, salt, tree nuts, or GMOs. Suitable for vegetarians/vegans.
Interactions and cautions
- Medications
- May interact with thyroid, sedative or immune medication. Review with your practitioner.
- Timing
- Separate from medications by 2 to 4 hours unless directed otherwise by a healthcare practitioner.
- Pregnancy and breastfeeding
- Consult a healthcare practitioner before use if pregnant or breastfeeding.
- General
- Use only as directed. Discontinue and consult a practitioner if you experience an adverse reaction.
This product is not intended to diagnose, treat, cure or prevent disease. Consult a healthcare practitioner before use. Free certified advisors are available at 1-888-386-1211, Mon to Fri, 9am to 5pm PT.
Questions about Natural Factors - Magnesium Bisglycinate Plus L-Theanine - 250 mg
- Is this the genuine, authentic product?
- Yes. It is identical to what you would pay full price for anywhere else, sourced through our authorized supplier relationships.
- How is the price below retail?
- We buy direct, with nobody in the middle taking a cut, and we sell it for close to what we paid. You see the price privately because you have unlocked the Vault.
- How fast does it ship?
- Orders placed before 12pm PT are processed the same day and ship within two business days. Shipping is free over $89, and a flat $9.95 under that.
- Can I return it?
- You have 30 days after it arrives to request a return. Product must be unused, in its original packaging, with proof of purchase, and return shipping is paid by you. Find it cheaper anywhere in Canada and we will match the price.