This week's "What's Ailing You" focuses on vitamin supplements.

A viewer is curious whether the marketing that warns people that they need more vitamin D is legitimate or just hype.

The Food and Drug Administration says it cannot vouch for any benefits because supplements are not regulated.

Dr. Joseph Feuerstein, of Stamford's Center for Integrative Medicine and Wellness, says bodies need the vitamin to absorb bone-building calcium. He adds that vitamin D deficiency has been linked to diabetes, obesity, depression and increased risk of heart attack.

Scientists say the best natural source of vitamin D is skin's reaction to sunshine. The second best is fish, including salmon, swordfish and mackerel, as well as foods like milk and orange juice.

Dr. Feuerstein also recommends taking vitamin D supplements if you need to boost your level. He says a simple blood test can get you a readout on your vitamin D level.

News 12 Connecticut wants to know, "What's Ailing You." You ask the medical question and we'll work to find you an expert's answer. Send your questions by way of Facebook or Twitter using the hashtag #WhatsAilingYou.