I have a friend who said that there is no way spf can be greater than 30 even with the claims of these extra high factor products, its just BS. I am going to ask her what her source was but she is a bit of a health buff like me and her sister is a RNHP so its their way of life. Her son who I care for has the mineral based sunscreen and its horrible to apply but worth it for his overall wellbeing so definitely an adjustment yes. My daughter is a red head and my son has lots of moles and burns easily like me so we are either always pale or frecklyI'm to busy to tan so I just found a nice natural bronzer and body brushing makes your skin glow too.