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Because joan is concerned about skin cancer, she uses a sunscreen when she is outside. at what spf level will sunscreen start to interfere with vitamin d synthesis
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Because joan is concerned about skin cancer, she uses a sunscreen when she is outside. at what spf level will sunscreen start to interfere with vitamin d synthesis

User Daniel Miladinov
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At SPF 23 the sunscreen start to interfere with vitamin D.
User Thurston
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