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Michael Siegel, from the Boston University School of Public Health

Neither device is rechargeable, so once the light blinks, that means its time to discard the device

Summary: Before meals (30-60 minutes) is most effective After meals less effective To view or add a comment, sign in #humantech, natural sunlight derived Vitamin D(3) has a built in block chemically so you are unable to make "too much." However, I will say that the point of supplements is that elderly particularly fail to metabolize Vitamin D enough even with sunlit periods in the day, so this is interesting biologically as an example of good 'human systems design,' yet hardly a substitute for good Vitamin D supplements in other situations when that system gets older and less efficient, right

1 x Hook / 1 Set hard rubber hose plug