If you have a genetic predisposition to produce little vitamin D via your own skin, then you should always monitor your vitamin D balance and have it regularly checked. It is very important to know your own genetic predisposition: vegetarians, bedridden patients and growing babies need twice as much vitamin D as adults (especially those with a darker complexion).
Furthermore, the ability of the body to produce vitamin D decreases with age, hence there is an increasing susceptibility to osteoporosis. Certain illnesses will also cause a decrease in production, for example thyroid deficiency or Crohn’s disease, or if you are taking cortisone preparations on a regular basis. You should then do the following: Step 1 – take a genetic test; Step 2 – measure your Vitamin D level; Step 3 – take vitamin D supplements as necessary.
