Rosemary oil is taking over TikTok. From before and after videos to scalp massages to homemade hair growth serums, it’s something a lot of people grab without hesitation. But if you’re pregnant and wondering “is rosemary oil safe during pregnancy for hair?” deserves a much deeper answer than what you’ll find in the comments of a TikTok. Here’s what the research really has to say on the topic, what doctors recommend, and what to try instead if your hair is thinning while pregn