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How To Optimise Vitamin D Absorption
If you live in the UK, it’s near impossible for the skin to make enough vitamin D all year round, especially when you consider all the different factors that can get in the way of the body’s vitamin D production processes.
Most people will need to supplement with the vitamin to keep levels in the optimal range, even if it’s just for a few winter months each year. And for those who are more at risk of deficiency, it’s likely they’ll need to supplement all year round. Here’s what you need to know about vitamin D absorption so you can make your recommendations as effective as possible.
Who is most at risk of low vitamin D?
• Children aged under 5
• Pregnant and breastfeeding women
• People over 65
• People who have low or no exposure to the sun
• People with darker skin
• Higher body fat mass and obesity
• Low income / materially deprived people
Different forms of vitamin D
• Vitamin D2 (Ergocalciferol) – the form that’s naturally present in plants
• Vitamin D3 (Cholecalciferol) – the form that’s naturally present in the skin of animals and is widely accepted to be the best form to supplement with.
Vitamin D absorption:
• Vitamin D is best supplemented in the form of D3 (cholecalciferol) – the form produced by the skin in response to sunlight (UVB) exposure. This form must then be converted in the liver (to calcidiol) and then in the kidneys to its active form (calcitriol).
• Vitamin D is passively absorbed in the lower part of the small intestine (the jejenum and ileum).
• Studies show that powdered, liquid or tablet supplements are all well absorbed. Research also shows that vitamin D is well absorbed both with and without food, and with or without fats too.
• Vitamin D works closely with vitamin K2 and it’s useful to supplement these two nutrients together for ongoing maintenance of healthy bones.
• What matters most is that if you are low in this nutrient or are at higher risk for deficiency, you take enough vitamin D regularly to keep your levels in the optimal range.
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