Yes. Absolutely. As long as you're using all natural henna and henna-herbal products, you won't have any problems. Problems can occur when nasty additives are placed into a poor quality henna powder (Metallic Salts) and they may react with the chemicals in the synthetic dyes (Ammonia). Brittle hair and unpredictable brassy colors may result if using poor-quality henna. That's why it is so important to do your homework, research, and purchase safe, all natural products. Hunt for a reputable company, and buy the best. You're 100% Safe Here: We use ONLY the finest, top-quality Henna & Natural Herbs.
Note: if you have very damaged hair from chemical dyeing or use large amounts of relaxer, your best option is to wait one month before using ANY hair products. And always test with harvested hair from a brush before initial application. Simply mix a little henna paste(Tbsp): Apply. Wait. Rinse. Review. If all good, proceed and enjoy.