Get a bottle of this crucial supplement for free.

Full disclosure: a famous "vitamin D doctor" from Cedars-Sinai all but begged one of our editors to get her D levels tested. The doc is convinced that vitamin D could stand between us and certain cancers. Our editor went to an independent MD, found out she was deficient, and started supplements. They made her feel completely renewed.

Turns out many of us are deficient and don't know it--and this time of year, it's especially hard to get enough sunlight, which prompts the bod to make D. Vitamin D is also essential for calcium absorption (hello, strong bones) and helps maintain a healthy heart. Bonus: it's good for mood and mental health, as our editor discovered (if you're dragging, you might be low in D).

Research shows that the US RDA for vitamin D, just 600 IU for most Americans, is likely too low. A daily dose of 3000 IU is now recommended as a good target dose. That's why we're excited about Pure Matters D3 supplements. They're the optimal form of vitamin D, and packed with 3,000 IU in each capsule.

Pure Matters is giving Vital Juicers a free bottle apiece! Get your bottle of vitamin D3 here. But hurry: they're only available until December 18, or while supplies last. Limit one per household.

You'll be walkin' on sunshine.

Know someone who works indoors? Send her this email!