Vitamin D is a hormone, not just a vitamin, that plays a crucial role in various bodily functions, including bone health, immune function and mood regulation. It exists in two main forms: vitamin D2 (from plants) and vitamin D3, which the body produces in response to sunlight and can also be found in certain animal foods like fatty fish and egg yolks.

Signs of vitamin D deficiency include bone pain, muscle weakness, mood swings, fatigue, hair loss, impaired wound healing, frequent infections and weakened immune function. These symptoms may indicate a need for vitamin D supplementation, especially if you're not getting enough sunlight or dietary sources.

It's recommended to take vitamin D supplements during the autumn and winter months, especially from October to April when sunlight exposure is limited. Some people, like those with darker skin or who spend little time outdoors, may need vitamin D supplements year-round. Daily or weekly doses can be taken depending on personal preference.

Yes, vitamin D has been shown to help regulate blood pressure, reduce inflammation and protect against cardiovascular diseases, contributing to better heart health.