<s>[INST] Do sunscreens interfere with the skin’s ability to synthesise vitamin D? [/INST] Yes; the use of sunscreens reduces the amount of vitamin D synthesised by the skin. However, sunscreens must be worn to prevent skin cancer. Source: Clinic Barcelona. Link: https://www.clinicbarcelona.org/en/assistance/diseases/osteoporosis/frequently-asked-questions. Field: Rheumatology. Disease: Ostoeporosis </s>