Best Magnesium and Potassium Supplements of 2026

Six hundred milligrams of magnesium is more than twice what most of the capsules here deliver, and it comes with 198 mg of potassium, also the highest in this group. That pairing is the whole pitch: if a 200 mg capsule hasn't touched your night cramps, the problem may be the amount rather than the brand. It's also a dose to build up to rather than start cold, since 600 mg is well beyond the 350 mg usually cited as the ceiling for magnesium from supplements.

We point to this one when someone has already tried a smaller dose and felt nothing. The magnesium arrives as a spread of chelated forms, aspartate, citrate and taurinate, rather than a single salt, and the tablet is certified vegan, gluten-free and kosher from a Certified B Corporation, a longer credential list than most bottles here carry.

What you pay for that dose is size. These are large coated tablets, slick but still a mouthful, and two a day with food is the labeled serving. If big pills have defeated you before, this is the bottle where that history matters most.

Per serving, nothing else in this guide costs less. A bottle holds 240 capsules, or 120 servings, each with 210 mg of magnesium from magnesium citrate and 99 mg of potassium from potassium citrate. Both minerals are named, both are dosed, and there's no proprietary blend hiding the amounts.

That's why we call this the value pick rather than the cheap one. The label is third-party tested, non-GMO, gluten-free and soy-free, and it's made in an NSF-certified, GMP-compliant, FDA-registered facility, the same paperwork you expect to pay more for. Citrate is also the form most people absorb easily, though it's the one that can pull water into the bowel when you take too much at once.

Two capsules make a serving and the bottle runs to 120 of them, so the economics improve the longer you stay with it. It's the bottle we point to when someone wants the minerals without paying for packaging or a name, and it's the one most likely to still be in the cabinet six months from now.

Taurine is the extra here, and it's why this bottle stays in the rotation. NOW pairs the aspartate forms of magnesium and potassium with taurine, an amino acid that turns up in the same territory these minerals work in, neuromuscular and cardiovascular function. It's a more considered pairing than another scoop of filler.

The manufacturing record is the real story. These capsules carry an A-rated third-party certification, the company runs ISO/IEC-accredited in-house labs, and the label covers kosher, non-GMO, dairy-free, egg-free, nut-free, soy-free and vegan in one go. NOW has been at this since 1968, and for something you swallow every day that paper trail is worth more than a fashionable mineral salt.

The catch is the serving. Two capsules once or twice a day means a full day can run to four, which is a lot of swallowing next to the once-daily picks here. We still recommend it, because the formula is sound, the certifications are the deepest in this group, and taurine is genuinely hard to find beside these two minerals, but it's the bottle for someone who doesn't mind a small handful.

The magnesium in this capsule starts as seawater. Solaray calls it marine magnesium, blends it with magnesium glycinate to reach 300 mg, then adds 99 mg of potassium and bromelain, a pineapple-stem enzyme you usually meet in digestive formulas rather than mineral ones.

Three hundred milligrams is a comfortable middle. It's enough to matter, it sits under the 350 mg generally treated as the ceiling for supplemental magnesium, and splitting it across two forms means the glycinate portion is the gentler half. The vegetable capsules are coated and go down more easily than their size suggests, which is not something we can say about every tablet in this guide.

We reach for this one when someone wants magnesium first and potassium second, and doesn't want to commit to a 600 mg tablet to get there. The bottles are made from post-consumer recycled resin and the formula is tested in-house in a GMP-certified facility, details that won't change your levels but do explain why the mid-range price doesn't bother us.

If you've left a bottle of magnesium capsules in a drawer because you couldn't face another one, this is the bottle that doesn't end up there. Ninety raspberry gummies, sugar-free and pectin-based, soft rather than rubbery, and the flavor is genuinely good, fresh rather than syrupy, which is unusual for a gummy with no sugar in it.

We like it for the obvious reason and a less obvious one. The obvious: adults who won't swallow pills will actually take these, and 90 pieces is a real supply. The less obvious: it's a busy formula, magnesium glycinate alongside vitamin D, B6, potassium, CoQ10 and black pepper extract, and the extras are a bonus rather than the reason to buy. The minerals are the point, and the taste is what keeps the bottle moving.

The thing to know before ordering is that these gummies merge. A pectin base and a warm delivery truck can leave you with a single block in the jar, and prizing them apart is nobody's idea of a morning routine. Keep the jar in the fridge and shake it before opening; the texture survives fine, and temperature is most of the difference between a gummy you finish and one you abandon.

Two hundred milligrams of each mineral, both as citrates, in a 240-capsule bottle. NatureBell's formula is the most symmetrical here, with neither mineral playing second fiddle, and citrate is the salt most people absorb without drama.

The credentials are straightforward: third-party tested for quality and potency, non-GMO, gluten-free, soy-free and dairy-free, with no preservatives or additives on the label. It's been sold in this form since 2017, longer than most of the gummies here have existed.

The 200 mg figures are listed as citrate salts rather than elemental amounts, so this isn't the bottle to choose if you're chasing a specific magnesium number from the label. If what you want is two well-absorbed minerals in one capsule at a fair price, that distinction matters a great deal less.

Where it earns its place is the absence of trouble. Post-workout cramping and sleep are what this bottle gets bought for, and the things we brace for at this price, an upset stomach, an oversized pill, a strange taste, are simply not part of its story. That's what a capsule you take every day should look like, and it's why it stays on this list without an award attached.

This is the bottle a lot of people find first. It's been listed since 2017, it's one of the most familiar potassium and magnesium capsules in this category, and the pitch is about as plain as supplements get: magnesium aspartate with potassium, 120 capsules, made in small batches, no extras.

Aspartate is a chelated form, and the capsules are small enough to take without a second thought, a genuine advantage over the 600 mg tablets in this guide. The formula is built around the pairing rather than the dose: two minerals that work together in muscle and nerve function, in the smallest package that carries them.

Digestion is the part to plan around. This is a formula that can upset a sensitive stomach, with nausea and loose stools the usual shape of it, and starting with one capsule at a meal rather than a full serving on an empty stomach is the sensible way in. For most people that adjustment is the end of it.

We keep it on the list because the capsule is easy to live with and the formula is uncomplicated, not because it does anything the others can't. If big tablets have been your problem and a gummy feels like too much of a compromise, it's a reasonable middle path, as long as you're willing to start slowly.