From a chemical perspective, magnesium hydroxide is a weakly alkaline substance with a pH value of approximately 10.5. In a weakly acidic environment on the skin surface, magnesium hydroxide will partially neutralize, forming magnesium ions and hydroxide ions. Research has shown that the permeability of intact skin to magnesium hydroxide is extremely low, about 0.001% -0.01%, which provides a basic guarantee for its safety.
Magnesium hydroxide is mainly used as an antacid, deodorizer, and thickener in personal care products. Clinical tests have shown that magnesium hydroxide does not cause significant skin irritation at concentrations below 5%. However, it is worth noting that even low concentrations of magnesium hydroxide may cause mild irritation reactions in patients with atopic dermatitis or impaired skin barrier function. A study of 500 volunteers showed that only 0.4% of participants experienced mild skin discomfort when using a deodorant containing 3% magnesium hydroxide.
The impact of long-term use of products containing magnesium hydroxide needs special attention. Research has found that continuous use of high concentration magnesium hydroxide products may alter the pH value of the skin surface and affect the skin's microecological balance. Therefore, it is recommended to observe skin reactions and use products containing magnesium hydroxide at appropriate intervals. For people with sensitive skin, it is recommended to choose products with magnesium hydroxide concentration below 1% and conduct local testing.
Based on existing research evidence, it can be concluded that magnesium hydroxide is safe for healthy skin under standardized usage conditions. But to ensure safe use, it is recommended to follow the following principles: choose products produced by legitimate manufacturers, pay attention to the concentration of magnesium hydroxide in the products, conduct skin tests before use, avoid using on damaged skin, and observe skin reactions after use. Through scientific understanding and proper use, the safety of magnesium hydroxide in the field of personal care can be fully guaranteed.
