Who is the free source of Vitamin D?

Who is the free source of Vitamin D? 

Answer:

 Sun

Star

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light and infrared radiation. It is by far the most important source of energy for life on Earth.

Surface temperature: 5,778 K

Distance to Earth: 149.6 million km

Mass: 1.989 × 10^30 kg

Age: 4.603 billion years

Radius: 696,340 km

Moons: 3122 Florence, 130 Elektra

Layers

The layers of the Sun are divided into two larger groups, the outer and the inner layers. The outer layers are the Corona, the Transition Region, the Chromosphere, and the Photosphere, while the inner layers are the Core, the Radiative Zone, and the Convection Zone.

Core

The Sun's core is the central region where nuclear reactions consume hydrogen to form helium. These reactions release the energy that ultimately leaves the surface as visible light. These reactions are highly sensitive to temperature and density.

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