Supplement School

Vitamin D supplements are safe when taken as directed. Learn who may need them, how much to take, possible side effects, and what to avoid combining with vitamin D.

 

Vitamin D and D3 are often used interchangeably, but they’re not exactly the same. Learn the key differences between vitamin D2 and D3, how each one works in the body, and which form may be more effective at raising vitamin D levels, plus dosage guidance, interactions, and what to consider before choosing a supplement.

Vitamin D is essential for strong bones, healthy muscles, immune support, and overall wellness — yet deficiency is incredibly common. This guide explains what vitamin D does, who needs supplements the most, recommended doses, and what the latest research says. If you’re low on sunlight or struggling to get enough through your diet, supplements are one of the most effective ways to support your health.

Fatigue and brain fog can sometimes be linked with low levels of key vitamins. Here are three nutrients commonly associated with energy and why they matter.

Vitamin K2 supports bone health, calcium balance, skin appearance, and general wellness. Here are the key benefits and why it is often paired with vitamin D3.

Want to protect your heart? Here are 5 simple habits, diet tips, and key nutrients that can support your cardiovascular health.