What is Magnesia sulphurica?

Magnesia sulphurica is a homeopathic single remedy made from Epsom salt. Its Latin name is Magnesii sulphas. Homeopaths reach for it for itchy skin, loose or upset bowels, thirst, and low, weepy moods.

The remedy is made by diluting the salt over and over, with hard shaking at each step. At the common 30C strength, in practice none of the starting salt is left. What you take is a sugar pellet or a few drops of water and alcohol.

Here is the short verdict. Trials do not show this remedy working better than a dummy pill. It has been used for a long time, but long use is not proof that something works, and this page keeps those two things apart.

How does Magnesia sulphurica work?

There is no accepted way this remedy could work at normal strengths.

Homeopathy rests on two ideas. One is that a substance that causes symptoms in a well person can ease those same symptoms when it is heavily diluted. The other is that water holds a kind of "memory" of what was in it.

Neither idea fits what chemistry and physics show today. At 30C there is no magnesium sulfate left to act on your body. Any change you notice is more likely to come from time passing, from care and attention, or from placebo (feeling better because you expect to).

Very low strengths are a different case. A 3X or 6X liquid can still hold real salt, and Epsom salt in real amounts pulls water into the bowel and acts as a laxative.

What forms does Magnesia sulphurica come in?

You will most often see small sugar pellets that melt under the tongue. Liquid drops in water and alcohol are also common.

Strengths are written as 6X, 30C or 200C. The higher the number, the more times the salt was diluted.

Plain Epsom salt sold for baths or as a laxative is not the same product. It is the raw salt, not a homeopathic remedy.

Where it comes from:

Magnesia sulphurica entered homeopathic practice in the 1800s, when Samuel Hahnemann and those who followed him tested substances on healthy people and wrote down what they felt. Epsom salt itself was known long before that as a purge, drawn from mineral springs at Epsom in England.

It is a smaller remedy in the homeopathic materia medica, not a headline one. It still appears in modern repertories and in home kits.

What does Magnesia sulphurica help with?

• Itchy skin and hives: Homeopathic texts point to itching that gets worse in bed at night. There are no published human trials of this remedy for skin itching, so this is tradition only. If your skin is broken, spreading or weeping, see a doctor.
• Constipation and loose stools: Epsom salt in real amounts is a known laxative, but the diluted remedy is not the same thing and has not been tested for bowel problems. Do not expect a 30C pellet to move your bowels. Bleeding, black stools or pain that does not settle need a doctor, not a remedy.
• Strong thirst: Old provings describe a dry mouth with a big thirst. No trials support this use. Sudden, heavy thirst with tiredness or frequent urination can be a sign of diabetes, so get a blood sugar check.
• Low, weepy mood and restless sleep: Homeopaths use it for sadness with broken sleep and strange dreams. Trial evidence does not separate homeopathy from placebo for mood problems. Ongoing low mood deserves real care from a doctor or therapist.
• Painful periods: Traditional use covers cramping pain with a heavy, dragging feel. No human trials exist for this remedy and this problem. Period pain that stops you working, or gets worse month by month, should be checked.
• Nerve pain and tingling: Provings mention numb, prickling limbs and shooting pain. This is a written tradition, not tested evidence. New weakness, numbness or face droop is an emergency, not a remedy case.

Which foods are rich in Magnesia sulphurica?

1. Nuts and seeds: good natural sources of magnesium
2. Dark leafy greens such as spinach: magnesium-rich
3. Beans and lentils: supply magnesium in the diet
4. Whole grains: a steady everyday source
5. Hard tap water in some areas: carries small amounts of magnesium sulfate

Practical Tips:

These foods supply magnesium as a nutrient. They are not related to how the homeopathic remedy is said to act.

What are the side effects of Magnesia sulphurica?

• No noticeable effect at all, which is the most common outcome
• Mild stomach upset or wind
• A short-lived flare of your symptoms, which homeopaths call an aggravation
• Bowel looseness or cramping from very low strengths that still contain real salt
• Reaction to lactose (milk sugar) in the pellets if you cannot digest it
• Rare rash or swelling from the alcohol or carrier in liquid drops
• Harm from delay if it is used instead of needed medical care

Good to know:

Side effects from a 30C remedy are rare, because there is in practice no active salt in it. The real risk is not the pellet. It is putting off treatment that works for a problem that is getting worse.

How much Magnesia sulphurica should you take?

• Recommended daily: There is no established dose, because there is no proven effect to dose for. Product labels usually suggest 3 to 5 pellets of a 30C strength, or about 5 drops of the liquid, up to three times a day. Let the pellets melt under your tongue rather than chewing them. If a homeopath has given you a personal plan, follow that instead of the box.
• Best time of day: Any time of day. Many labels suggest spacing doses evenly and keeping them away from strong mint, coffee or strong smells, though there is no evidence these matter.
• With or without food: Usually taken between meals, about 15 minutes before or after eating or drinking. This is custom, not a tested rule.
• Time to effect: No reliable time to effect can be given, because trials do not show an effect beyond placebo. People who report a change often say it came within a day or two.
• How long to take it: Homeopaths usually suggest a few days at most for a short-term problem. Stop and rethink after about a week if nothing has changed. Do not keep taking it for months in place of care for a problem that is not getting better.