"...... This is also my first soap with EDTA. I still have mixed feelings about using it, but I’ve had a couple more cases of DOS. EDTA seems like the lesser of two evils.
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This might not help the thought of using EDTA in your soap but it might.....providing you don't already know this.
EDTA is used in the medical field for heavy metal blood poisoning, as well as to lower dangerously high levels of calcium and to control disturbances to the heart rhythm. I'm guessing, with the various forms of EDTA, that the use of the chelators that are injected into humans (and in animals by veterinarians) are different kinds than what's used in soap. However, the way I looked at including a tiny bit in my soap was that if it's used interveiniously for numerous days than a tiny bit in my soap probably isn't gonna kill me. I only started including it in mine a few months ago. I began making soap maybe 3 years ago but took off 10 months; I returned to soap making for us 3 months ago. That's when I began its use and love what it does for my bath water; soap scum is less noticeable for those who shower but I enjoy long baths--love to soak.
Upon seeing a particular specialist for the first time, I had to submit a list of my medications so I included supplements as well. She told me she was glad to see I was taking zinc with a chelator. I need zinc so b/4 purchasing just any kind I researched what the best kind would be. Those with a chelator create a stable, water-soluble product that will more easily be absorbed. No use taking something that my body will not effectively process, resulting in expensive pee (lol). Since I'm already taking a chelator, adding a tiny bit to my soap that will be only on my skin for a short time and then rinse off didn't bother me. Lol, when I began to research EDTA (for the purpose of soap) I wasn't taking zinc; I read all kinds of scary stuff regarding it and then remembered reading the same fearmongering regarding citric acid.
https://www.drugs.com/mtm/edetate-disodium-edta.html
https://www.webmd.com/vitamins-and-supplements/edta-uses-and-risks#1
https://wagwalking.com/treatment/chelation-therapy