Best Magnesium L-Threonate Supplements 2026: Cost per Effective Dose
Top pick for Magnesium L-Threonate: Life Extension Neuro-Mag Magnesium L-Threonate (90 Capsules) — 144mg per 3 capsules (2,000 mg Magtein / 144 mg elemental), $1.02/day. Our best-value pick.
Registry check · Magnesium L-Threonate
Does anyone independently verify Magnesium L-Threonate supplements?
1 of these 3 products are confirmed in NSF/ANSI 173, which puts this category in the minority with any verified option at all. The other 2 are not listed anywhere we can check — not evidence against them, only an absence of independent confirmation.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the Magnesium L-Threonate dose column either way.
3 checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What 3 Magnesium L-Threonate labels show
Priced per day, these magnesium L-threonate products run $1.00 to $1.02 , across 3 brands.
Servings here are close enough to compare directly, so the gap is a real one: Double Wood at $1.00 buys the same thing as NOW Foods at $1.02.
All Magnesium L-Threonate Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Double Wood Magnesium L-Threonate (120 Capsules) | Double Wood | 144mg / 4 capsules (2,000 mg Magtein) | $1.00 | None | Buy | |
| Life Extension Neuro-Mag Magnesium L-Threonate (90 Capsules) | Life Extension | 144mg / 3 capsules (2,000 mg Magtein / 144 mg elemental) | $1.02 | None | Best Value | Buy |
| NOW Magtein Magnesium L-Threonate (90 Veg Capsules) | NOW Foods | 144mg / 3 capsules (2,000 mg Magtein) | $1.02 | None | Buy |
Our Picks
Best Value: Life Extension Neuro-Mag Magnesium L-Threonate (90 Capsules)
144mg per 3 capsules (2,000 mg Magtein / 144 mg elemental). $1.02/day. 30 servings per container at $30.78.
Life Extension Neuro-Mag Magnesium L-Threonate (90 Capsules) →
Dose check · Magnesium L-Threonate
Most of these Magnesium L-Threonate products need more than one serving to reach the studied dose
The research on Magnesium uses 200 mg to 400 mg (elemental). The products here are labelled from 144 mg to 144 mg a serving, so the cost of a day at the studied dose is not the price in the table — it is that price multiplied. Life Extension Neuro-Mag Magnesium L-Threonate (90 Capsules) takes 2 servings, which makes a real day $2.05 rather than $1.03.
The label trap on Magnesium L-Threonate:Compound weight != elemental. A '1000 mg magnesium glycinate' capsule delivers ~140 mg elemental. Always read the elemental figure on the Supplement Facts panel.
Method: studied range from our own Magnesium L-Threonate dosage guide (PMID 11794633), priced against the 3 products above — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
The evidence · Magnesium L-Threonate
What the published reviews of Magnesium L-Threonate concluded
- Oral application of magnesium-L-threonate enhances analgesia and reduces the dosage of opioids needed in advanced cancer patients-A randomized, double-blind, placebo-controlled trial. · Cancer medicine, 2023
“L-TAMS outperforms a placebo in enhancing the analgesic effect of opioids and reducing the necessary opioid dosage. Moreover, L-TAMS can significantly relieve opioid-induced constipation. These advantages may be beneficial to patients with advanced cancer.”
Method: PubMed searched in humans for randomised trials with Magnesium L-Threonate in the title; these 1 of the 1 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Magnesium L-Threonate will work for you — each of these reports an average across trials, and null findings are shown here as readily as positive ones.
How these 3 Magnesium L-Threonate products were ranked
1 of these 3 are confirmed in a certifier's registry — the only magnesium L-threonate rows where the claim is independently backed — and the rest are ranked on cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever magnesium L-threonate you buy. Full methodology.