Let's do a small exercise about dissolving MgCl2 flakes. First thing to know is that the best effects are reported by users who dissolve 3 – 5% concentration in their bath tub. (Concentration by weight)

Taking into account the conic shape; position of the overflow and water displacement by body volume, on average there’s about 65 liters of water in the bath tub.
65 Liters of water equals roughly 65 kg of water. In order to have a > (greater than) 3% concentration of MgCl2 by weight, one should add:
> 65 x 0.03 =
> 1.95 kg pure MgCl2
By nature MgCl2 –flakes contain 47% pure MgCl2 and 63% crystal water.

> 1.95 kg pure MgCl2 equals
> 1.95 / 47 x 100 =
> 4.14 kg Flakes.

The Magnesium Health Institute recommends 4 – 5 kg of MgCl2 – flakes in an 'average' bath tub for the best effect.


Question: can I make magnesium oil from magnesium flakes?

Answer: yes, however, don't use 'do-it-yourself magnesium oil'!


Magnesium oil

Magnesium oil is not actually oil but is referred to as such because it feels so smooth. It is actually the highest concentrated liquid form of pure natural magnesium chloride, dissolved in water (brine):

MgCl2 31%, density 1310 gr/l

Natural magnesium oil meets  all topical demands, assuming that it is produced under a strict regime and controlled continuously with regard to composition, and trace elements, etc.

1,000 g magnesium oil contains 690 g water (69%)


Magnesium flakes

 Magnesium chloride flakes are crystallized magnesium  chloride. Actually it is an hexahydrate: each molecule  MgCl2 is surrounded by 6 molecules of crystal -       water: MgCl2(H2O)6

MgCl2 47%, density 1569 gr/l

Flakes are produced by an evaporating process.  

Magnesium oil (the brine) is heated up to approximately    1600 Celsius; water is evaporated and  MgCl2 flakes  remain    after crystallization on a cooling-belt.
1,000 g MgCl2 flakes holds 530 g(crystal-)water  (53%)

Unpredictable chemical reactions

When using redissolved magnesium chloride flakes in high concentrations unpredictable chemical reactions may occur.

Many (re-)dissolving tests were performed

Due to heating for evaporation, magnesium chloride flakes come with very small amounts of by-products like MgOHCl (magnesium hydroxide chloride) and MgCO3 (magnesium carbonate). This explains the white haze that might occur after dissolving flakes. It is completely negligible for applications up to 5% (e.g. bath or foot soak)

In addition, there are always minor amounts of trace elements which are completely unharmful under normal conditions or even required as life essentials. But  they react to an increasing extent unpredictably when flakes are dissolved in increasingly higher concentrations. Together with everyday ingredients, such as oxygen, there is always the risk that undesirable or even harmful by-products occur.


  • Flakes may not be used in a concentration higher than 5% (e.g. bath or foot soak)
  • The purest  MgCl2 is indispensable for topical applications (concentration up to 31% )
  • The Magnesium Health Institute strongly discommends  ‘DIY  magnesium oil’ 

What about chlorophyll products? They are rich in magnesium?

Indeed chlorophyll is being used in liquid form and tablets. Not much research is done on liquid chlorophyll, but some state that chlorophyll would do everything from cleaning dirty colons to providing vital life forces to the brain. There can be found claims that it can cure, help to cure, or improve burns, leg ulcers, trench mouth, tonsillitis, peptic ulcers, several types of vaginitis, urinary bladder diseases, high blood pressure, colitis, tooth decay, arthritis, athlete's foot, constipation, hay fever, rectal fissures, anaemia, gas and "acidic" bowels, stomach and intestinal problems, laryngitis, ear problems, impetigo, help tired feet, soothe gunshot wounds, destroy bacteria, and improve metabolism.

Most claims regarding chlorophyll products are based on research performed early in the 20th century, before antibiotics were available to fight infections. Although many of these studies are considered invalid by modern scientific standards, there is evidence that chlorophyll can kill certain types of bacteria. Also, although chlorophyll kills some bacteria, it actually promotes the growth of others. Products labelled "chlorophyll" should not always be considered "natural." Often they are breakdown products produced by exposing plant material to chemicals such as acetone, hexane gas, and copper. The resultant material is no longer chlorophyll.

Although natural chlorophyll contains magnesium, to restore magnesium balance, a product with good bioavailability of the magnesium should be provided as a prior. The magnesium oil as nowadays available fully meets the demands.

What is Magnesium Oil?

Magnesium oil is not actually oil but is referred to as such because it feels so smooth. It is actually the highest concentrated liquid form of pure natural magnesium chloride, dissolved in water.

How much magnesium equals 5 ml of Magnesium Oil?

5 ml of Magnesium Oil (MgCl2 31%, density 1310 gr/l)
6,6 g MagOil (or liquid/brine)

1 g Magoil
77 mg elemental Mg

5 ml of Magnesium Oil
6,6 x 77 =
508 mg of elemental Magnesium

Does drugs deplete magnesium in the body?

Hundreds of drugs cause magnesium deficiency. See this document for a list of drugs that has influence on magnesium in the body:

Contact the Magnesium Health Institute for questions about Magnesium and Health.