Question: what is the best way to increase vitamin d levels?
Answer: Spend time in sunlight. Vitamin D is often referred to as “the sunshine vitamin” because the sun is one of the best sources of this nutrient. ... 
Consume fatty fish and seafood. ... 
Eat more mushrooms. ... 
Include egg yolks in your diet. ... 
Eat fortified foods. ... 
Take a supplement. ... 
Try a UV lamp.