box of dvelop for a more resilient immune system

d.velop™ a more resilient immune system*

with a 3x more effective vitamin D supplement*†

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Embrace the possibilities of 3x potency*

Healthy vitamin D levels are essential for immune system resilience. When it comes to optimizing your immune system, vitamin D is your secret weapon. Only d.velop™ products are made with calcifediol, a clinically tested form of vitamin D that helps achieve optimal levels 3x faster and 3x more effectively than conventional vitamin D supplements, so you can go confidently.*†

See the d.velop™ Difference

Understand and optimize your immune health

d.velop Diagnostic Kit

The diagnostic kit

Most of us don't get enough vitamin D to fulfill our body’s needs. The d.velop™ vitamin D test kit 2-pack, available for free with a three-month subscription (a $100 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

The d.velop™ app

Along with our exclusive d.velop™ formula that helps you achieve optimal vitamin D levels, you get the d.velop™ app free. The app provides you with actionable information to help understand your immune health with a holistic immunity score. And, it helps you address other potential immunity gaps based on your lifestyle, including nutrition, sleep, and environmental factors. It makes it easy to track your progress toward a healthier immune system. It is also supported by live coaching from registered dietitians, available to answer your questions and help ensure you achieve 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



“If you are looking for a way to improve your levels…d.velop is it!”

Jacqui O



“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