Yes, you can absolutely continue your hair care routine with a few simple adjustments. Take your New Follihair tablets daily as prescribed, as this oral supplement won't interfere with your topical treatments. For Qsera hair serum to work effectively, it must be applied to a clean, dry scalp. On the day you oil your hair or apply henna, avoid using the serum. Instead, wash your hair thoroughly to remove all oil or henna residue, let your scalp dry completely, and then apply your Qsera serum. This ensures the serum absorbs properly. Henna can sometimes dry your hair, so keep it well-conditioned.