We recommend seeing your health care provider to discuss this question.
When you live in the northwest, a routine daily supplement is usually necessary.
Coldwater fish that is wild, such as salmon, cod, halibut, and sardines are your best choice for low mercury and high amounts of vitamin d3.
You can also take a supplement of vitamin d3 of 2000 iu daily
a blood test can be done to measure the amount in your blood and you can discuss this with your health care provider.