Colloidal gold and gold nano flakes are both cited as being more effective forms of the material, although given nanoparticles' unregulated status, safety might also be a concern. In any case, it's clear that gold as an ingredient isn't going away any time soon, and the cache of using something so precious on your skin is always going to be appealing. Have you ever used a product that listed gold as an ingredient? And what do you think about using precious metals in cosmetics generally?
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