DIY sunscreen: Dermatologists warn against trend for homemade SPF

the Oncology Nurse Advisor take:

A current Internet trend is DIY sunscreen recipes. Many bloggers who post the recipes claim that commercial products contain harsh chemicals that could be as bad, or worse, than using nothing. However, dermatologists are warning people that do-it-yourself recipes cannot guarantee broadband protection or ensure that the SPF is high enough. Many online recipes use various oils such as coconut, almond, rosehip, and carrot seed oils. These oils actually promote sunburns, and have the same effect as using baby lotion. Even when using effective ingredients, an incorrect process can render the product ineffective. Although commercial sunscreens do contain chemicals that are considered to be endocrine disruptors, chemical-free sunscreens are an excellent option. Most bloggers and doctors generally agree that mineral sunscreens are best. Those would be creams where the chief protection is provided by zinc oxide or titanium oxide.