Department of Defense has separately prohibited its use by Service Members.
Key Takeaway: Graying hair is caused by a combination of age, genetics, oxidative damage, emotional stress levels, smoking, and certain nutrient deficiencies
This may lead to damage building up on the skin
Compare at 4-week intervals rather than daily
If a woman intending pregnancy identifies an issue with oxidative stress management via labs like the above, it absolutely behooves her to take general measures towards dampening that oxidative stress as well as specific measures towards addressing the very root of her oxidative stress issues
This does not mean it is illegal to possess or use for research purposes, but it cannot be marketed or sold as a treatment within the US