Adding sunscreens at a certain concentration doesn't guarantee a certain SPF since various factors of the formula can influence the SPF. Thus, you cannot pre-determine a SPF just based on the amount and type of sunscreens you have added to a formula. You can only assume an approximate SPF range. Therefore, if you want to sell your products you'd have to test your product in clinical trials with a FDA approved laboratory to determine the exact SPF before making a SPF claim.
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