Did the Prophet, peace and blessings be upon him, use kohl? And has a hadith been reported regarding that? And is what is said in America true, that kohl causes poisoning?

It is mentioned in the hadiths that the Prophet (ﷺ) applied kohl and commanded its use. He would apply it to the right eye three times and to the left eye twice. The best type of kohl is antimony (ithmid) because it clears the vision and promotes hair growth. Antimony preserves eye health, strengthens eyesight, and cleanses the eye of harmful substances. It is recommended to apply kohl an odd number of times, and the Sunnah is to apply it three times to each eye. Antimony is known for its quality and benefits for the eye. Good kohl does not harm the eye; rather, it benefits it. However, some recently manufactured types may contain chemical substances that are harmful to the body.