Episode 01 · Available now · 7:22
What Does Vitamin D Do in Your Body?
How vitamin D helps calcium absorption, supports bone health, and participates in normal muscle and immune function. [1]
Watch on YouTubeFree video series · 12 episodes
Vitamin D 101.
One question.
A clearer understanding.
Food, daily intake, supplements, and blood tests, explained by Elizabeth Miller, ND. Start with the first episode, then explore the questions covered across the series.
Episode 1 is available now. More episodes coming soon.
Vitamin D Deficiency: Signs, Symptoms & Who Is at Risk
Risk factors, symptoms, and why fatigue or muscle aches alone cannot tell you whether vitamin D is low. [1]
Read this topic in the guideHow Much Vitamin D Do You Really Need? (The Guidelines Changed)
Daily needs, supplement doses, and the 2024 prevention guideline: why they answer different questions, and where personal clinical advice fits. [2]
Read this topic in the guideVitamin D3 vs D2: Which One Should You Take?
D2 and D3, their sources, and how research compares their effects on the blood marker 25(OH)D. [1]
Read this topic in the guideVitamin D and Your Immune System: What Science Shows
Vitamin D’s role in immune function, with a careful look at what supplementation trials can—and cannot—show. [1][2]
Read this topic in the guideCan You Get Enough Vitamin D from Sunlight?
How skin makes vitamin D, why production varies, and how to keep sun protection part of the picture. [3]
Read this topic in the guideDoes Vitamin D Help with Depression and Mood?
Low levels, mood, and depression: separating observational associations from trial evidence, with realistic expectations for supplementation. [1]
Read this topic in the guideDoes Vitamin D Help with Weight Loss?
Why an association between body weight and vitamin D status does not make vitamin D a weight-loss treatment. [1]
Read this topic in the guideDo You Actually Need K2 with Vitamin D?
The rationale for combining D3 and K2, the limits of outcome evidence, and medication considerations—including vitamin K antagonists. [4]
Read this topic in the guideWhat Foods Are Highest in Vitamin D? (And Is It Enough?)
Fatty fish, fortified foods, and smaller sources—plus practical ways to compare amounts and count your total intake. [1]
Read this topic in the guideVitamin D Blood Tests: What Your Number Can and Can't Tell You
What 25(OH)D measures, why a result needs context, and why routine screening is not recommended for every generally healthy adult. [2]
Read this topic in the guide7 Vitamin D Mistakes People Make (And How to Avoid Them)
Dose, food, form, and medication questions that deserve attention, without turning every everyday choice into a mistake. [1][4]
Read this topic in the guideKeep learning with Elizabeth.
Follow the channel for upcoming Vitamin D 101 episodes. Prefer to read? The complete guide is ready whenever you are.
Sources for the episode summaries
- NIH Office of Dietary Supplements. Vitamin D: Fact Sheet for Health Professionals.
- Endocrine Society. Vitamin D for the Prevention of Disease. Clinical practice guideline, 2024.
- American Academy of Dermatology. Vitamin D.
- NIH Office of Dietary Supplements. Vitamin K: Fact Sheet for Health Professionals.
General education, not individualized medical advice. Medical disclaimer.