Can anyone help me with a problem, please, that is driving me nutty. Sorry if it’s a bit longwinded. I want to start making my own magnesium oil (which is really a brine) because it's cheaper than buying the ready made stuff. I'm trying to get the dosage right for my skin, but I'm struggling with my maths.

I have bought some magnesium chloride flakes which contain approx 46% magnesium chloride and the rest is water content. I have been told to add equal quantities of flake to warm water which will produce a brine/oil containing 23% magnesium. Therefore if I take 500g of magnesium chloride flake and dissolve it in 500ml of water to get 1 litre of brine, the magnesium content is 23g, or 23,000mg.

So, if I want to calculate how many mg of magnesium is in 1 ml of brine, I divide 23,000mg by 1000 ml which gives me 23mg of magnesium per ml of brine, which gives me 115mg of magnesium per 5ml teaspoon. Am I right so far, please?

This is where I have a brain block and get confused: I’ve bought myself an atomizer and I’ve calculated that I can get 80 sprays out of 10ml of the brine; which means (I think) that there are 8 sprays per 1 ml of brine. Therefore if 8 sprays give 1ml of brine, does that mean that there is 2.875mg of magnesium per spray (I did 23mg divided by 8 to get that figure)?

But 10 sprays would only give me 28.75mg of magnesium which doesn't seem strong enough for me, as I'd have to spray my skin loads of times to get 100mg of magnesium on my skin via the spray bottle; so if I want to double it to start with (to get a solution which is twice as strong) presumably I need to double my magnesium flake content per mls of water? Therefore instead of using 500g of flake per 500ml, should I use 1kg of flake per 500ml of water, to give a 46% brine solution? If so, this would presumably give me 46mg of magnesium per ml of brine, and 230mg of magnesium per 5ml teaspoon; and 5.75mg of magnesium per spray (2.875 x 2)? This still doesn't seem strong enough, for my spray bottle, but I'll come back to this later.

Also, (this is where I show my ignorance big time) if I make up 1 litre of brine solution which contains 23% magnesium, (made up from 500g of mag flake – 46% mag content - plus 500ml of water), then I’ll get a magnesium brine containing 23% magnesium which will contain 230grams of magnesium per litre of brine solution. However, if I siphon off 100ml, will my 100ml bottle of magnesium contain only 23gram of magnesium because 23% of 100 is 23?

Finally, regarding my need to get a stronger solution: the last magnesium oil product I bought from the shop contains 31% magnesium content per 100ml of brine/oil, and they say that each spray contains 19mg of magnesium (so 10 sprays should give 190mg of magnesium) – and they say that their bottle contains up to 800 sprays. So how many grams of my magnesium chloride flake (at 46% mag content) would I need to add to 1 litre of water to get a 31% magnesium content in the brine solution, please?

Thanks in advance to anyone who might be able to help.

Annie.

## Bookmarks