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Magnesium
The most reused ingredient in our library. It carries ten authorised EU health claims, which is more than almost anything else we work with, and it is the reason several formulas can never share a window with each other.
WHAT WE ARE ALLOWED TO SAY
Ten claims. All of them authorised.
These are the exact wordings on the EU register for magnesium. We do not paraphrase them into something that sounds stronger, and we only use them where the dose clears 15% of the NRV, which is the condition attached to all ten.These are the exact wordings on the EU register for magnesium. We do not paraphrase them into something that sounds stronger, and we only use them where the dose clears 15% of the NRV.
Magnesium has no authorised claim for sleep, for anxiety or for cramps, however often you read otherwise. Where we use it in a sleep formula, the sleep claim comes from the melatonin next to it, not from the magnesium.
WHY BISGLYCINATE
The claim is the same. The stomach is not.
Every magnesium salt carries the same ten authorised claims, so the form is not a claim argument and we do not use it as one. We chose bisglycinate for tolerance, and because a liquid system lets us split the amount instead of pushing it all at once.
Highest magnesium per milligram of salt and the worst tolerated. Common in pressed tablets because it takes up less room in the pill.
Better tolerated than oxide, mildly laxative at the top of the range. A reasonable default that we did not pick.
Chelated to glycine, which is also the calming amino acid in our sleep formula. Gentler on an empty stomach, which matters because we serve this one away from meals.
There is no authorised claim that says bisglycinate absorbs better than citrate, and we are not going to imply one. It is a tolerance decision, made because our doses are served daily and often on an empty stomach.There is no authorised claim that says bisglycinate absorbs better than citrate, and we are not going to imply one. It is a tolerance decision.
WHERE IT APPEARS
Ten of the twenty-nine carry magnesium.
This is why the engine has to think about totals rather than about formulas one at a time. Two of these in the same window and you are already at the ceiling.
THE CEILING
250 mg a day, across everything you take.
The limit applies to your total, not to each formula on its own. It is the single reason the engine schedules formulas into windows instead of just adding them together, and it is the kind of check a shelf of separate bottles cannot make for you.The limit applies to your total, not to each formula on its own. It is the single reason the engine schedules formulas into windows instead of just adding them together.
Two magnesium formulas never land in the same window. If your plan needs both, one goes to the morning and the other to the night.
When a second formula has to share a window, the engine serves it at 100 mg instead of 200, and says so in the app.
If neither fits, the lower-priority formula does not enter your plan and you are told which one and why.
WHAT IT REACTS WITH
Documented pairs, not hunches.
Magnesium is one of the 140 ingredients in our library, so it has 139 possible partners. These are the ones we have documented so far, out of the 443 pairs on file.
Both use the same transport at high doses. In Bones & joints they are deliberately held at a 4:1 ratio; elsewhere they are moved into different windows.
At the top of the range they compete. Iron is served in the morning before food, magnesium at night away from it, which resolves it without lowering either.
Magnesium can interfere with certain antibiotics, bisphosphonates and thyroid medication. The app asks about medication before any formula carrying it is assigned.
443 of the 9,730 possible pairs in our library are documented, which is 4.55%. The rest are not "safe", they are simply unchecked, and we would rather write that down than let the number look like a badge.443 of the 9,730 possible pairs in our library are documented, which is 4.55%. The rest are not safe, they are simply unchecked, and we would rather write that down than let the number look like a badge.
SOURCES
Everything on this page, with its reference.
Reviewed by VION nutrition team · last reviewed 16 September 2026
140 INGREDIENTS · 64 IN USE TODAY
Every one of them has a page like this.
What it is, what we are allowed to say about it, which formulas carry it, what it reacts with and where each of those statements comes from. No proprietary blends, no hidden amounts.