Kalia, you are doing great with your english and I'm very glad to be speaking with you.
Perhaps it will help to give you a brand name to search for. Phillips Milk of Magnesia is a very well known brand here in the US. If taken internally, it acts as a laxative but we are only using it as a gargle to pull excess acids out of the mouth/head area. We don't swallow it.
If you purchase the original flavor you have fewer ingredients to worry about with your MCS. What I do is add a few drops of real peppermint oil to the original MOM....just like ML suggested.
Original Inactive Ingredients
purified water, sodium hypochlorite
Mint Inactive Ingredients
flavor, mineral oil, purified water, saccharin sodium, sodium hypochlorite
Of course both of these also have magnesium hydroxide as the main ingredient.
You may try posting a request on the Ask Curezone board to see if anyone knows of a source in your area to purchase MOM. I really don't know of another source of magnesium hydroxide....perhaps ML does.
As far as H202 35% vs 3%, that is strickly up to you. If you wish for the purest because of your MCS, then I would go with the food grade and learn to dilute it correctly to make it the right strength for your bath.
For people like myself, I just use regular 3% that I can easily get at the pharmacy or grocery store. The foodgrade is harder to find here in the US (other than online) and is much more expensive.
I'm so glad you are purchasing a refractometer. So many people do not realize how important this is for learning to choose better foods.
I wish you much success. :)
Edit by Moreless: The Active Ingredient in Milk of Magnesia is Magnesium Hydroxide, this is the Main Ingredient!
All the inactive ingredients may be to keep this in solution, for flavor, etc? End Edit.