Extra Strength Vitamin D SoftgelsCostco’s store-brand vitamin soft gels have everything you need—with zero frills. Each soft gel delivers 2,000 IU vitamin D, and with 600 doses in a bottle, you won’t have to worry about restocking for a while. Best of all, they’re USP-verified.
Vitamin D3 for Immune & Bone HealthMegaFood’s D3 is paired with an organic whole foods blend containing brown rice, broccoli, parsley, carrot, and beet, which the brand says can help the body use vitamin D more synergistically. The tablets (which come in 1,000 IU doses) are non-GMO verified, dairy-, gluten-, and soy- free, and have been tested to be free of harmful herbicides, pesticide, and glyphosate residues.