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Magnesium Sulfate in cosmetics
Hi. A lot of cosmetics , escpecially with ascorbic acid or dragons blood, contain magnesium sulfate. I can’t find a reason why magnesium sulfate is adding to ascorbic acid? Is it adding to improve consistency or is magnesium sulfate is a chelator or what? In some publication I found laconic explanation that “magnesium sulfate stabilize vitamin C” - but what kind of stabilizing it can be?
Examples:
Serum LIQ CC: Propylene Glycol, Aqua, L-Ascorbic Acid, Tocopheryl Acetate, Sodium Hyaluronate, Magnesium Sulfate, Methylparaben, Propylparaben, Polysorbate 20Serum C20®+ Lightening: Purified Water, 20% L-Ascorbic Acid, Niacinamide (Vitamin B3), Alpha Arbutin, Citric Acid, Magnesium Sulfate, Glycerin.Serum C20®+Ferulic: Purified Water, 20% L-Ascorbic Acid, Ethoxydiglycol, DL- Panthenol, Glycerin, Magnesium Sulfate, Ferulic Acid, Sodium Hyaluronate, Sodium PCA, Phenoxyethanol, Caprylyl Glycol, Sorbic Acid.Do you know why magnesium sulfate is adding to cosmetic (omitting cases in formula with high level magnesium sulfate to raise the level of magnesium). How many percent is adding, <2% ?
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2 Replies
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Not an answer to your query, by any means but, a very large European soap manufacturer (multiple thousands of tonnes per week) I worked for many years ago used a mix of magnesium sulfate and sodium silicate as a soap preservative.
I enquired why they did this and received the answer “we’ve always done it like this”.
I did a bit of experimental work and found that yes, soap with the preservative mix DID keep better than soap without.
I left the company and never found out anything more about it.
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Thank you, this is something new. This is interesting. Especially saying: “we’ve always done it like this”
I found that information “After addition of water causes the constraint of its structure, leading to a decrease in volume” - but this concerns MgSO4*H20 (I don’t know if the same thing happens after adding MgSO4*7H20 (Epsom salt).
Maybe this is why magnesium sulfate is a preservative or co-preservative?
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