Puritan'S Pride Vitamin D3 5000 IU Liquid Dietary Serum, 125 Mcg = D3 5000 IU with 59 Doses

Puritan's Pride Vitamin D is a fat-soluble vitamin that can be obtained through the diet or synthesized in the skin upon exposure to sunlight. Vitamin D3, the form of vitamin D formed in the skin, is a potent and active form of the vitamin. Vitamin D2 is a vitamin D analog formed in plants, mushrooms and yeasts during photosynthesis. While vitamin D2 is sometimes used in food fortification, Puritan’s Pride supplements provide the active form. Vitamin D plays a regulatory role in the growth, differentiation, and proliferation of different types of white blood cells.8** It is important to regulate these processes to maintain immune balance. Think of a thermostat set to 70 degrees. When the temperature falls below 70 degrees the heat comes on but once the temperature is reached, the heat needs to turn off or else the temperature will continue to rise indefinitely. The same delicate balance is needed for our immune systems to maintain optimal health.

• As we age, the skin produces vitamin D less efficiently. Vitamin D absorption may also decrease with age, making vitamin D supplementation especially beneficial for older individuals.
• When used as directed, a sunscreen graded SPF-10 will block 90% of UVB radiation reaching the skin.10 UVB radiation is needed to stimulate production of vitamin D.
  
• Residents of northern climates may have inadequate exposure to sunlight in order to produce sufficient vitamin D, especially during the winter months.
  
• Wearing protective clothing such as hats and long sleeves inhibits the body’s natural production
  of vitamin D.
  
• The stimulation of vitamin D production in skin can depend on the intensity of the sun’s UVB rays. When you are shorter than your shadow, UVB radiation is often not strong enough to produce vitamin D.¹¹ Air pollution and the presence of clouds can also have a major impact on the intensity of UVB radiation that reaches the ground.