Vitamin D, often called the sunshine vitamin, is freely available, yet nearly one billion people worldwide are deficient. Something clearly isn’t adding up. People even try to compensate by taking supplements. However, in most cases, even supplementation falls short. Dr. Dmitry Yaranov, a leading heart transplant cardiologist from Memphis, has explained the real reason behind it.
When Supplements Fail
In a video shared on Instagram, the doctor spoke about how supplements fail to provide any meaningful benefit in those with vitamin D deficiency. “The problem usually isn’t the supplement itself. In most cases, it’s because vitamin D is being taken incorrectly, the dose isn’t appropriate for the degree of deficiency, or the body lacks some of the nutrients needed to properly activate and use it. I see this all the time in the clinic,” Dr. Yaranov said.
He added, “Someone has been taking vitamin D faithfully for months, but when we check their labs, their levels are still low. The good news? The fix is often surprisingly simple. It usually comes down to these three common mistakes.” So what are these mistakes?
Mistake #1: Taking It Incorrectly
Most people don’t realise that vitamin D is a fat-soluble vitamin. This means it requires dietary fat for optimal absorption. Many people make the common mistake of taking vitamin D supplements on an empty stomach. This dramatically reduces bioavailability, sometimes by as much as 50% or more.
“Taking it with a meal that contains healthy fats can significantly improve absorption compared with taking it on an empty stomach,” the doctor said. This could include eggs, avocado, olive oil, nuts, or fatty fish.
Mistake #2: Using the Wrong Dose
Most people assume that one size fits all when it comes to supplementation. But that’s not true. The standard daily recommendation may fall short for many people, leading to deficiency.
“A dose that maintains normal levels may not be enough to correct a significant deficiency. The only way to know is to check your blood level and adjust accordingly,” the doctor explained. So, before you pop those supplements, ask your doctor to order blood work.
Mistake #3: Ignoring Key Nutrients
Vitamin D doesn’t work alone. You need another nutrient for that: magnesium. “Magnesium helps activate vitamin D in the body, and low magnesium levels may limit its effectiveness even when you’re taking a supplement consistently,” the doctor explained. Without adequate magnesium, your body cannot efficiently utilise vitamin D, even if you take supplements regularly.
What You Should Know
If you’ve been taking vitamin D supplements and seeing no results, hold on. Before you increase your dose, evaluate these three factors. Ensure you’re taking your supplement with healthy fats, get your blood levels tested to confirm your baseline and proper dosing, and assess your magnesium intake. These adjustments often produce noticeable improvements within 8–12 weeks. It’s not the pill that’s failing you, but how you’re using it.
