21 CFR 73.2190 - Henna.
(a)Identity. The color additive henna is the dried leaf and petiole of Lawsonia alba Lam. (Lawsonia inermis L.). It may be identified by its characteristic odor and by characteristic plant histology.
(b)Specifications. Henna shall conform to the following specifications:
(c)Uses and restrictions. The color additive henna may be safely used for coloring hair only. It may not be used for coloring the eyelashes or eyebrows, or generally in the area of the eye.
(e)Exemption from certification. Certification of this color additive for the prescribed use is not necessary for the protection of the public health and therefore batches thereof are exempt from the certification requirements of section 721(c) of the act.