Documentary Lovers claims that coconut oil has a natural SPF factor in their Ditch those Toxic Sunscreens; Go Natural with Coconut Oil article:
Coconut oil has an SPF of 10 which means 90% of beneficial vitamin D creating UB-V rays are blocked.
It's not an isolated source as "coconut oil spf 4" returns 244,000 results. So people attribute an SPF to coconut oil when ingested or applied externally. I know that coconut oil can relieve sunburn and otherwise irritated skin, but how does it fare in the sunscreen metric?