Which oils are not safe to use on the skin during pregnancy?

You have to be careful with neroli (orange), lavender, and cinnamon. they have been known to induce labor in some people. Generally with essential oils you need to be more cautious because they do have medicinal properties also. Nut oils are usually safe. If you want to be extra careful, you never have to worry about olive oil. Aloe is a gel, and is great for limiting damage due to stretch marks. Just remember to look at essential oils as medicine and avoid them is best until after the baby is born. Plus there are some oils that some people are sensitive to, for example orange oil. In it’s pure state even if you are not pregnant makes people more sensitive to the sun. Pregnancy makes it worse, that’s all. but keep it easy and stick with olive oil for that extra skin conditioning. A side note, fragrance oils don’t have the same affect as they are artificial.