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Schuessler Tissue Salts Mag Phos Oral Spray

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Price $13.18 Save 6% RRP $14.09

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Price $13.18 Save 6% RRP $14.09

You'll Earn pts
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Mag Phos

What is Mag Phos traditionally used for?

Mag Phos is traditionally used for calf cramps and mild nerve pain. It's tissue salt No. 8, magnesium phosphate made up at 6X, one of the twelve Schuessler tissue salts, and it also comes as a lactose-free spray.

Christina Hanley, BHSc (Nutritional Medicine), Digital Experience & Content Manager, Mr Vitamins

Christina HanleyBHSc (Nutritional Medicine), Digital Experience & Content Manager
Checked this page October 2026

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Is this the right tissue salts for you?

Mag Phos is a traditional product with a name that sounds like a nutrient, so these are the questions our naturopaths ask before you buy it.

A good fit if

  • You follow the tissue salt tradition and No. 8 is the salt you're after
  • You understand it's traditional use and not a magnesium supplement
  • You want the spray because you're avoiding lactose

Check with us first if

  • It's for a child aged 1 or over. There's no safety data on tissue salts for children.
  • You're pregnant or breastfeeding. There's no specific evidence either way, and the pregnancy cramp trials tested real magnesium, not Mag Phos.
  • You're avoiding lactose, which most tablets are made with, or you're managing blood glucose or tooth decay, since some tablets use sucrose.
  • You already take a magnesium supplement and want to know how the two differ.

How the forms compare

  • Mag Phos 6X tablets. Best known for: The standard retail form, at the potency Schüssler used. Absorption: Not applicable; there's no nutritional dose of magnesium to absorb. Typical use: Let it dissolve on your tongue, following the pack directions.
  • Mag Phos oral spray. Best known for: A liquid carrier instead of a lactose tablet. Absorption: Not applicable at 6X. Typical use: If you're avoiding lactose or would rather not take a tablet.
  • Combination tissue salt formulas. Best known for: Several salts in one tablet, sold for a named concern. Absorption: Not applicable at 6X. Typical use: Whatever that product's own AUST L indication says.
  • A magnesium supplement instead. Best known for: A measured milligram dose of magnesium. Absorption: Well studied, and it varies by form. Typical use: When you're genuinely not getting enough magnesium.

Common questions

Is Mag Phos a magnesium supplement?

No. It's magnesium phosphate prepared at 6X, diluted one in ten six times over, which leaves no meaningful amount of the mineral in the tablet. That's not a magnesium dose. If you're worried about your magnesium intake, a magnesium supplement gives you milligrams you can count, and it's the one the nutrient research is about.

Can I take Mag Phos instead of magnesium for cramps?

They're different products. Mag Phos is the tissue salt tradition's choice for cramp, but no trial has tested it. And real magnesium hasn't done much better: a Cochrane review found oral magnesium changed cramps with no known cause by just 0.18 a week, with a confidence interval from 0.84 fewer to 0.49 more. If your cramps keep coming back, talk to your doctor.

Can I give Mag Phos to my teething baby?

Not by mouth if your baby is under 12 months. Australia's ingredient rules say an oral magnesium phosphate medicine must not be directed for use in babies that young, and that includes tissue salts. For an older child, check with us first, because there's no safety data on tissue salts for children. A pharmacist or your child health nurse can help with teething.

How much, and when

Reference values. The magnesium figures don't apply to this product. For context, the NHMRC sets magnesium at 310 to 320 mg a day for adult women and 400 to 420 mg a day for adult men. A 6X tablet adds nothing meaningful towards either.

Typical supplemental range. Schüssler's own standard, which Australian packs still follow, was the sixth decimal dilution. In his words: "In my practice I generally use the 6th decimal trituration." Dosing directions vary by brand, so follow the label on your pack.

Upper level. Australia's permitted ingredients list (Schedule 1) sets no daily limit for magnesium phosphate. The NHMRC upper limit for magnesium from supplements, 350 mg a day from age 9, applies to magnesium as a nutrient, not to a 6X tablet. The laxative warning for magnesium phosphate only applies at nutritional doses, so it doesn't apply at 6X.

Worth knowing. If you're worried about your magnesium intake, this isn't the product that fixes it. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food sources

The register deliberately doesn't pair tissue salts with food, because doing so implies the tablet supplies the nutrient. The magnesium your muscles actually use comes from food and, where needed, from a nutritional supplement, not from Mag Phos.

Before you start

If any of these sound like you, talk to one of our naturopaths or your doctor before you start.

  • Babies under 12 months. Magnesium phosphate medicines taken by mouth must not be directed for use at this age (Schedule 1 items 1777, 3169, 3170).
  • If you actually need magnesium. A 6X tablet supplies no nutritional dose of magnesium.
  • Children. There's no safety data for tissue salts in children.
  • Pregnancy and breastfeeding. We found no specific evidence.
  • If you're avoiding lactose. Homoeopathic tablets are made by repeatedly grinding the ingredient into lactose.
  • If you're managing blood glucose or tooth decay. Some homoeopathic tablets contain sucrose, which is a permitted excipient.
  • Any condition that needs a diagnosis. The main risk is delaying care that works.
  • If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before you start.

The evidence, and its limits

  • Calf cramps are what tradition uses Mag Phos for; Cochrane found even real oral magnesium didn't reliably reduce cramps. (DOI record)
  • Schüssler listed Mag Phos for "cramps of the muscles of the calves" and "pains in the limbs"; that's traditional use only. (Internet Archive / US National Library of Medicine digitised)
  • There's no trial of Mag Phos itself, and no homeopathic remedy has convincingly beaten placebo in systematic reviews. (DOI record)
  • In a 2021 meta-analysis of 4 trials in 332 women, oral magnesium didn't ease leg cramps in pregnancy. (DOI record)
  • Magnesium phosphate pentahydrate (Schedule 1 item 3169) is allowed for active, excipient and homoeopathic use, with conditions. (Schedule 1, item 3169)
  • In 41 homeopathy trials, side effects were no more common than in the comparison groups (OR 0.99, 95% CI 0.86 to 1.14). (DOI record)

How it works

In Schüssler's system, each tissue salt matched a mineral he believed your cells were short of. Mag Phos was his salt for spasm and pain, and he listed "cramps of the muscles of the calves" and "pains in the limbs" among its uses. That's tradition, not a research finding, and no trial has tested Mag Phos itself. The name tells you where it sits in the system, not what's in the tablet. A 6X tablet has been diluted one in ten, six times over, so there's no meaningful amount of magnesium left and your muscles aren't getting magnesium from it. Even proper magnesium doses haven't reliably eased cramps in trials, so with Mag Phos you're choosing a tradition rather than a proven effect.

The Australian rules

Magnesium phosphate pentahydrate is item 3169 on Australia's permitted ingredients list (Schedule 1). It's allowed for active, excipient and homoeopathic use, with conditions. Magnesium phosphate tribasic (item 3170) and dibasic magnesium phosphate trihydrate (item 1777) have the same conditions. The one that matters most here: a magnesium phosphate medicine taken by mouth must not be directed for use in babies under 12 months. There's also a laxative warning, but it only applies at nutritional doses of 350 mg or more of magnesium a day for anyone 9 or over, with lower thresholds for children, so a 6X tablet doesn't trigger it. On claims, the permitted wordings include muscle cramp, leg cramp and mild nerve pain claims that may rest on traditional evidence. Being allowed isn't the government endorsing a product, and it says nothing about whether the product works.

Read the instrument: Schedule 1, item 3169.

Not sure this is the right form for you? Ask one of our naturopaths. It is free and takes 10 minutes.

Mag Phos is one form of Tissue Salts. Always read the label and follow the directions for use. General information only, and not a substitute for advice from your doctor or one of our naturopaths.

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