Magnesium Gluconate

Magnesium gluconate is a water-soluble magnesium salt primarily used as a skin-conditioning/mineral replenishing ingredient, typically at low concentrations, and it is generally well-tolerated in leave-on products. Clinical irritation and patch-test signals are uncommon compared with acids, surfactants, or fragrance allergens, but as an electrolyte salt it can occasionally sting compromised/barrier-impaired skin (e.g., eczema or post-procedure). Given sensitive-skin safety priorities, I rate it as very gentle rather than inert. Safety Notes: In commercial skincare, magnesium gluconate is most often used as a skin-conditioning/mineral-salt component in leave-on serums/creams and mineral/“electrolyte” mists at very low levels (around 0.01–0.1%), where it primarily supports marketing claims and mild conditioning without impacting texture. Higher-strength consumer products (typically leave-on gels/creams and some specialty “magnesium” body products) are observed up to about 3–5%, with practical limits driven by water solubility, tack/feel, and potential for stinging/irritation at elevated ionic strength; rinse-off formats usually sit toward the lower end because benefits are harder to substantiate with brief contact time.