To add another data point: 4,000 IU (two Kirkland capsules) daily keeps my Vitamin D levels at the high end of the reference range. I also take six Kirkland fish oil capsules which happens to hit the 1,500 mg DHA+EPA target suggested in the article.
Honestly, Costco supplements are hard to beat since they're both USP certified and are usually the cheapest.
Honestly, Costco supplements are hard to beat since they're both USP certified and are usually the cheapest.