Magnesium forms compared: aspartate, glycinate, oxide, citrate

Magnesium is one of the most common shortfalls in an Indian diet and one of the most confusing things on a supplement shelf, because the form attached to it changes how much you absorb, what it does to your gut, and how much of the pill is actually magnesium.

Elemental magnesium is the only number that matters

Start here, because it invalidates most label comparisons.

Magnesium is always bound to something else. A capsule saying "magnesium citrate 500 mg" is describing the weight of the whole compound, not the magnesium in it. The magnesium portion, called the elemental amount, is a fraction of that, and the fraction differs by form.

Two products can print the same milligram number on the front and deliver very different amounts of magnesium. If a label does not state elemental magnesium, it has given you a number you cannot compare.

The common forms

Magnesium oxide

Around 60% elemental magnesium, the highest of the group, and the cheapest. Its absorption is poor, commonly cited in the low single-digit percentages. Much of it stays in the gut, which is why it works as a laxative and why it is the form behind most reports of magnesium upsetting someone's stomach. High on paper, low in practice.

Magnesium citrate

About 16% elemental. Better absorbed than oxide, still with a laxative tendency at higher amounts. A reasonable middle option and very widely used.

Magnesium glycinate

Roughly 14% elemental. Bound to glycine, well absorbed and the gentlest on the gut, which is why it is the form usually recommended to people who could not tolerate the others. Its weakness is bulk: the low elemental percentage means a meaningful dose takes physical space, which is a real constraint in a blended powder.

Magnesium L-aspartate

Bound to aspartic acid, an amino acid. Well absorbed, and considerably more soluble than glycinate, which matters a great deal if the product has to dissolve cleanly in cold water rather than sit in a capsule.

Magnesium sulphate

Epsom salt. A bath ingredient. Not an oral supplement in this context.

Why a powder and a capsule choose differently

This is the part that explains most of the confusion. Capsules do not need to dissolve, so they can use whichever form is best absorbed regardless of how it behaves in water. A powder you stir into a glass has a second constraint: an insoluble magnesium form leaves grit at the bottom and a chalky mouthful at the end.

A brand that picks the most fashionable form for a drink mix without checking solubility ends up with a product people stop finishing. A supplement only works if you actually take it, which makes texture a formulation decision rather than a cosmetic one.

What to check

• Is the form named specifically, or is it just "magnesium"?
• Is elemental magnesium stated, separately from compound weight?
• If it is oxide, is the brand quiet about absorption?
• For a powder, does the brand explain why that form was chosen?

Safety

Excess magnesium generally causes loose stools before anything else, which is a useful self-limiting signal for most healthy adults. Anyone with reduced kidney function should not supplement magnesium without medical advice, because clearing it is a kidney job. Supplements in India are regulated as food and treat nothing.

Where SWATVA stands

Signal uses magnesium L-aspartate, chosen because Signal is a powder that has to go clear in cold water. Glycinate would have read better to anyone who has done their reading, and it would have made the drink worse. That trade is written up rather than hidden.

Magnesium sits alongside taurine and algal DHA in Signal's lipid and mineral group. The full pack-order list is on the ledger.

The first batch is 55 pouches and the application takes four minutes.