Herbal Gray Hair Reverse Essential Oil for Man & Woman, Grey Hair Darkening Conditioner Essence, Restore Natural Black Color With Usma Polygonum Multiflorum Herb Oil Blend for Hair Growth Serum

Here's your revised summary incorporating the additional details:**"I used the product for about four weeks on one part of my head to see if there was a difference, but I didn’t notice any changes. After that, I researched the ingredients and found that most are generally safe for external use. However, there is insufficient information on the safety of Polygonum multiflorum when applied to the skin. While its internal use has been linked to liver damage and other serious health risks, external use may still pose risks, especially for individuals with hormone-sensitive conditions or allergies. Additionally, Polygonum multiflorum may have estrogenic effects, and its topical risks are not well understood. To minimize potential allergic reactions or sensitivities, a patch test is recommended before use."**

Don’t buy. Could not get the smell out for days.