seek ones that are made from 100% pure henna leaf powder (preferably from a fresh crop). Make sure it has been properly stored in a deep freezer, too, if possible. "Powders should be vacuum sealed ...

ORGANIC HENNA & BOTANICALS: Organic henna leaf powder, pure botanicals, and nothing else goes into our time-tested hair dyes. CHEMICAL FREE: Our conditioning hair colors are ammonia-free ...

A 2020 study in the International Journal of Herbal Medicine showed that regular application of henna leaf paste not only reduced hair fall but also enhanced the shine and thickness of hair.

Antibacterial Effects of Methanolic Leaf Extracts of Henna (Lawsonia inermis) Against Two Most Common Pathogenic Organisms: Gram Positive Staphylococcus aureus and Gram-Negative Escherichia coli.