I have a pretty significant amount of grey that I'm not willing to acknowledge yet so I henna. As far as regrowth goes, that obvioulsy isn't going to change, so whether you use a natural hair colorant or a synthetic one isn't going to matter from that standpoint.
If I'm going to go through all the work, I'm going to go natural, personally. I don't want the exposure to potentially or proven harmful chemical agents. For me, that makes all the difference. I'll put up with frequent root applications and the occasional henna gloss to keep everything looking good and me feeling happy.
When I was still resisting the red, I used to use a brown hair colorant by L'Oreal (the thick creme one, I can't remember the name). The smell alone was enough to really put me off, but I wanted brown hair (go figure...I've learned to embrace my red over the last few years) and was willing to put up with it until the colorant started making my scalp burn and my head itch for days after the application.
That said, if you're willing to risk the chemical exposure, try to find the safest options out there and go for it. You're the one who has to be happy with the finished result and with the amount of effort you put in.
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