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Out of curiosity I did some research and found a vitamin d2 d3 dificiency test on Amazon. Pretty expensive! ( not available in ny ).I also looked at long term storage of vitamins for space flight. Some interesting stuff there if you’re into multivitamins. Centrum I read doesn’t degrade after 4 months in space. But they wouldn’t be using normal dosages. So some special prep. They don’t want astronauts eating each other and keeping them psychologically fit is a top priority in low grav. If anyone has a smart AI and a rather large bunker….. PPPPPPP