When I first stumbled upon this recipe for DIY sunscreen, I was a little wary because the SPF factor is unclear. But, after researching zinc oxide, I've come to find out that it is the best absorbent of both UVA and UVB light and it is photostable (meaning its chemical breakdown is unchanged upon sun exposure). The good news is that the SPF factor is quite high. The bad news is that it leaves a white mark wherever you apply it.
The original recipe doesn't call for an essential oil, but I've tweaked it a bit. I really like the way that just one drop of a powerful botanical oil can cover up that zinc smell. My pick is peppermint, but I'd also recommend rosemary or lavender. Here's what you'll need:
For step-by-step directions on how to make your own sunscreen,