What is the truth about v d i am less than 20 v d according to blood test?

Low Vit D is rampant: 60% of the american public have low vitamin d levels, and it is crucial for immune system functioning, bone health and a host of normal bodily functions. It is thought that many avoid the sun due to fear of skin cancer, and sunblocks make the issue worse. Supplement by using vit d-3, and get levels up to about 50 or 60, if possible.