I've read that this happens, but I don't think its harmful. Everytime I do a henna I actually look out for it, but it never happens to me. I use the Yemen henna, too. Great stuff.

Still the fact that it does happen kinda freaks me out. Not so much about the henna but about other dyes and skin products. It really proves that thinks we put on our skin do get absorbed in our bodies.
Have several allergies and sensitivities.
Current products
Low Poo/Cowash: Rio Grande Herb Co Negrita and Amole Deep Treatment Concentrate, Magick Botanicals (MB) Shampoo (diluted)
Rinse out/Leave in: MB with apricot kernel and jojoba oils added
Protein Treatment: MB Conditioner for Thinning Hair, IAgirl's protien treatment
Style: MB Gel mixed with LOTD Aloe Vera Gelly

2b-c, need lots of moisture, likes protein in moderation.