Magnesium Glycinate With L-Theanine (2026): 4 Checked, 1 Tested
Buy Theralogix Magnesium L-Theanine Complex, the only one of 4 products here that NSF/ANSI 173 lists by name. Two capsules give 200 mg of magnesium as glycinate and 200 mg of L-theanine for $0.87 a day. Want more magnesium for less? BIOptimizers gives 350 mg for $0.80 a day.
Our pick for: glycinate plus L-theanine, on a testing list
- A day
- $0.872 capsules at Amazon's price.
- A pack
- $78.02180 capsules, 90 days
- In 2 capsules
- 200 mg + 200 mgMagnesium, as glycinate chelate, and L-theanine
- Testing list
- NSF/ANSI 173Listed by name, read November 12, 2026
Why we pick it NSF/ANSI 173 lists Theralogix by name, for every lot, and it is the only one of the four on a testing list. Two capsules give 200 mg of magnesium, under the 350 mg limit. A bottle lasts 90 days.
Which magnesium glycinate with L-theanine should you buy?
A magnesium glycinate and L-theanine blend puts two ingredients in one capsule, so read the milligrams of each on the label. We checked four products sold on Amazon that hold both: Theralogix, BIOptimizers, Periselle and TRIP Calm. Each has its own choice below.
BIOptimizers Magnesium Glycinate Breakthrough
The label gives 350 mg of magnesium as glycinate and 200 mg of L-theanine in 2 capsules, plus 50 mg L-glycine, 0.85 mg vitamin B6 and 5 mg of an ionic trace mineral complex. Choose it if you want more magnesium, 350 mg, with 200 mg of L-theanine for $0.80 a day.
$0.80 a day · $39.99 for 50 days
Check price on AmazonPeriselle Sleep Support
The label gives 150 mg of magnesium as bisglycinate and 200 mg of L-theanine in 3 capsules, plus 200 mg lemon balm extract and 200 mg GABA. Choose it if you want lemon balm and GABA in the same capsule.
$1.50 a day · $45.00 for 30 days
Check price on AmazonTRIP Calm Magnesium Powder
The label gives 250 mg of magnesium as glycinate and citrate and 50 mg of L-theanine in 1 teaspoon of powder, plus 50 mg lion's mane. It has 50 mg of L-theanine. Choose it if you want a drink mix at $0.67 a day.
$0.67 a day · $19.99 for 30 days
Check price on AmazonNature's Truth Magnesium Glycinate 200 mg, on a testing list, no L-theanine
NSF/ANSI 173 lists it by name as a capsule with a serving of 2 capsules. The label gives 200 mg of magnesium as glycinate in 2 capsules and no L-theanine. Choose it if you want tested glycinate and will take L-theanine on its own, or not at all.
$0.30 a day · $17.78 for 60 days
Check price on AmazonHow much magnesium and L-theanine does a serving give, and what does it cost?
The four magnesium and L-theanine products and one tested glycinate without L-theanine, at Amazon prices read November 12, 2026. Magnesium and L-theanine are the amounts on each label's panel for the serving shown. A day is the price divided by the days a pack lasts at that serving a day. NSF/ANSI 173 is an independent testing standard for supplements; the list names each product it covers.
| Product and serving | Magnesium | L-theanine | A day |
|---|---|---|---|
| Theralogix Magnesium L-Theanine Complex180 capsules; 2 capsules; magnesium glycinate chelate; on NSF/ANSI 173 | 200 mg | 200 mg | $0.87 |
| BIOptimizers Magnesium Glycinate Breakthrough100 capsules; 2 capsules; magnesium glycinate; not on a testing list | 350 mg | 200 mg | $0.80 |
| Periselle Sleep Support Magnesium90 capsules; 3 capsules; magnesium bisglycinate; not on a testing list | 150 mg | 200 mg | $1.50 |
| TRIP Calm Magnesium Powder, Pomegranate30 teaspoons; 1 teaspoon; magnesium glycinate and magnesium citrate; not on a testing list | 250 mg | 50 mg | $0.67 |
| Nature's Truth Magnesium Glycinate 200 mg120 capsules; 2 capsules; magnesium glycinate; on NSF/ANSI 173 | 200 mg | none | $0.30 |
How much magnesium is too much?
NIH's upper limit for magnesium from supplements is 350 mg a day for adults. At the serving shown, BIOptimizers gives 350 mg, exactly that limit; Theralogix gives 200 mg, Periselle gives 150 mg, TRIP Calm gives 250 mg and Nature's Truth gives 200 mg.
Questions people ask
Which magnesium and L-theanine products are on a testing list?
One of the four: Theralogix Magnesium L-Theanine Complex (NSF/ANSI 173). NSF lists it by the name on its listing, as a capsule with a serving of 2 capsules.
How we picked
We looked up the magnesium glycinate products on Amazon that also hold L-theanine and read each label from the supplement facts photo on its Amazon listing on November 12, 2026. We searched NSF/ANSI 173 and NSF Certified for Sport on November 12, 2026 and USP on November 11, 2026. We priced each pack on November 12, 2026.
Sources
- NSF/ANSI 173 listing: Theralogix, LLC, Magnesium L-Theanine Complex, capsule, 2 capsules, all lots, read November 12, 2026.
- NSF/ANSI 173 listing: Piping Rock Health Products Inc. DBA Nature's Truth, highly absorbable magnesium glycinate 200 mg, capsule, 2 capsules, all lots, read November 12, 2026.
- NSF Certified for Sport search and NSF/ANSI 173 company searches for each brand, read November 12, 2026; USP list read November 11, 2026.
- Supplement facts photos on the Amazon listings for Theralogix, BIOptimizers, Periselle and TRIP, read November 12, 2026.
- NIH Office of Dietary Supplements fact sheet on magnesium: the adult upper limit for supplements.
- Amazon product listings and prices for the five products, read November 12, 2026 through the Amazon Creators API.