box of dvelop for a more resilient immune system

d.velop™ stronger immune health

3x faster, 3x more effective than the average vitamin D supplement*⁺

Now 30% off through Cyber Monday with CODE: HOLIDAY30

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Understand and optimize your immune health

d.velop Vitamin D pill

Maximize your immunity

d.velop™ products are the only vitamin D supplements with calcifediol, a clinically proven form of vitamin D that raises vitamin D levels 3x faster than other supplements.*†

THE d.velop™ DIFFERENCE
d.velop Diagnostic Kit

The test kit

The d.velop™ vitamin D test kit, available for free with a three-month subscription (a $70 value), will help you first understand your current vitamin D deficit, and then track your progress as you reach recommended levels — which can happen in as few as 14 days.

Get the Test
d.velop mobile app screen

At your fingertips

Track your progress toward a healthier immune system and improved vitamin D levels with the d.velop™ app. Simple, straight-forward support from Registered Dietitians designed to help you reach your goals.

Get the App

See what others are saying.



“After taking the test and finding out I was Vitamin D deficient, I started taking d.velop supplements. My vitamin D. levels had risen within only two weeks.”

Juliann N



“Taking my d.velop has made me more energetic and feeling better.”

Andrew S



“This is an amazing at-home test and perfect for anyone wanting to boost their vitamin D levels within a month.”

Deanne G



“I went to a baseball game for the first time after the pandemic due to d.velop. I would not have gone if not for d.velop.”

James J



“Great for building a resilient and strong immune system quickly!!”

Jane W



"…my level went from 17.9 to 35 in 2 weeks! "

Lynn M​



“Immunity is more important than ever, especially as we continue to support our health through the COVID-19 pandemic…supplemental nutrition is a big part of this equation.”

Certified Dietitian Nutritionist

Melissa Rifkin, MS, RD, CDN



“More than 9 in 10 people don't get enough vitamin D from food alone. That's why we created the most effective vitamin D available as a supplement.”

Chief Science Officer

Nate Matusheski, PhD



“Vitamin D is a foundational immune system nutrient. It’s important that we assess our supplemental needs as we look to stay healthy year-round.”

Registered Dietitian

Chloe Giraldi, MS, RD, LDN