25% level of zinc oxide is thought to provide sun protection equivalent to an SPF rating of 25-30.
We do not list this on the label because our product is not an FDA OTC product with a lab tested SPF rating.
Here are some great articles to read so that you may form your own personal decision about sunscreen and protection:
https://theskincareedit.com/2017/06/02/how-to-choose-best-sunscreen
https://www.makingcosmetics.com/How-Can-I-Get-a-SPF_ep_60.html
https://www.ewg.org/sunscreen/report/imperfect-protection/
https://en.wikipedia.org/wiki/Sunscreen
https://www.health.harvard.edu/blog/shopping-for-sunscreen-are-all-brands-equal-2017062611947