As autumn shortens the days and the NHS prepares its annual call for vitamin D supplementation, a London cardiologist is asking the public to slow down and seek clarity before reaching for the bottle. Dr Osman Najam's counsel is not a rejection of the vitamin's importance — bones, muscles, and calcium regulation all depend on it — but a reminder that sufficiency is not the same as surplus, and that more of a good thing is not always better. In a culture prone to treating supplements as insurance policies, his message is quietly radical: know your own body first.
Cardiologist warns: Get tested before taking vitamin D supplements this winter
If you're normal, focus on the things that actually move the needle
Mark
So the NHS says everyone should take vitamin D from October to March. Why is the cardiologist saying that's not quite right?
Mimi
He's not saying the NHS is wrong, exactly. He's saying the blanket recommendation doesn't fit everyone. If you're already at a healthy vitamin D level, taking more doesn't help you—it just accumulates. The benefit only comes if you're actually deficient.
Luke
But how many people actually know whether they're deficient? That's the gap, isn't it? The NHS recommendation is easy to follow. Getting tested requires a doctor's appointment.
Mimi
True. But that's why he's pushing for testing before the season starts. October 1st is the deadline, so there's time to get it done now.
Mark
What about the people who don't have time or access to testing? Are they better off taking the supplement anyway?
Mimi
That's the practical question. The cardiologist's point is that if you're not deficient, the supplement doesn't hurt you—it just doesn't help. So it's not dangerous, just unnecessary for some people.
Luke
And the other thing he mentions is that you can get vitamin D from food and sunlight. How much does that actually matter in the UK winter?
Mimi
He says 15 to 20 minutes outside a few times a week helps. Plus fatty fish, egg yolks, fortified milk. It won't eliminate the need for supplements for everyone, but it's a real contribution.
Mark
So the takeaway is: test first, supplement only if needed, and don't expect vitamin D alone to prevent disease?
Mimi
Exactly. And remember that sleep, movement, and stress management matter more for heart health than mega-dosing any single nutrient.
Luke
One thing worth noting: the NHS guidance is still sound for most people, especially those who know they're low. The cardiologist isn't saying ignore it—he's saying be intentional about it.
El Pulso
- A cardiologist is pushing back against the assumption that vitamin D supplements are universally beneficial, warning that people without confirmed deficiency gain nothing from taking them.
- The NHS October supplementation deadline creates a seasonal rush that may lead many to dose themselves without ever checking whether they actually need it.
- Excessive vitamin D does not prevent heart disease or cancer at the rates many hope — the evidence behind those popular claims is far thinner than public enthusiasm suggests.
- Dr Najam points to overlooked alternatives: fatty fish, egg yolks, fortified foods, and even 15 minutes of outdoor exposure several times a week can maintain healthy levels without supplements.
- His wider argument reframes the conversation — movement, sleep, and stress management remain the most powerful levers for cardiovascular health, and no single nutrient should overshadow them.
As autumn shortens the days and the NHS prepares its annual call for vitamin D supplementation, a London cardiologist is asking the public to slow down and seek clarity before reaching for the bottle. Dr Osman Najam's counsel is not a rejection of the vitamin's importance — bones, muscles, and calcium regulation all depend on it — but a reminder that sufficiency is not the same as surplus, and that more of a good thing is not always better. In a culture prone to treating supplements as insurance policies, his message is quietly radical: know your own body first.
As the days grow shorter and the NHS prepares to recommend vitamin D supplements from October through March, consultant cardiologist Dr Osman Najam is urging people to pause before they comply. The vitamin is genuinely important — it regulates calcium and phosphate, supports bones, teeth, and muscles, and its absence can cause serious conditions like rickets in children and osteomalacia in adults. In a country where winter sun is scarce, deficiency is real and common.
But Najam's message cuts against the grain of popular habit: only those who have actually been tested and confirmed as deficient should supplement. People already at healthy levels, he argues, gain no extra protection from taking more — the excess simply accumulates without benefit. The widespread belief that higher doses guard against heart disease, cancer, or autoimmune conditions is not well supported by the evidence, however confidently it circulates.
For those who do need it, modest doses of 1,000 to 2,000 IU daily are sufficient. Najam also highlights how often people overlook dietary and lifestyle sources — oily fish, egg yolks, fortified foods, and even brief outdoor exposure a few times a week can meaningfully sustain levels. People with darker skin tones need longer sun exposure to produce equivalent amounts, a nuance that matters when applying general guidance across diverse populations.
His broader point is one of proportion. Supplementation is a supporting measure, not a centrepiece. The interventions that most reliably protect cardiovascular health — regular movement, quality sleep, managed stress — deserve the attention that mega-dosing a single nutrient tends to absorb. His practical advice is simple: get tested before October. If you're deficient, supplement. If you're not, invest your energy somewhere it will actually make a difference.
As the days shorten and people spend less time outdoors, the NHS recommends that nearly everyone take a vitamin D supplement from October through March. It's standard advice, widely followed, and backed by public health guidance. But a London cardiologist is asking people to pause before they start—and to get tested first.
Dr Osman Najam, a consultant cardiologist, has been pushing back against what he sees as a widespread misunderstanding about vitamin D supplementation. The vitamin itself is real and necessary. It regulates calcium and phosphate in the body, keeping bones, teeth, and muscles strong. Without enough of it, children can develop rickets, and adults may experience bone pain from a condition called osteomalacia. In the UK, where winter sun is scarce, deficiency is common. The NHS acknowledges this, which is why it suggests everyone consider a daily supplement between October 31 and March 31.
But Najam's core message is simpler than the blanket recommendation suggests: only people who are actually deficient should take supplements. "If you're genuinely deficient, and I mean actually tested and not guessing, then yes, supplementing makes sense," he explained in a recent social media post. "But if you're already at a healthy level, taking more doesn't give you extra protection; it just sits there." The distinction matters because many people assume that more vitamin D is always better—that it will prevent heart disease, cancer, or autoimmune conditions. The evidence for those claims, Najam said, is weaker than most people believe.
For those who do need supplementation, the dosage is modest. Most guidelines recommend between 1,000 and 2,000 international units daily for adults, though individual needs vary. Najam emphasized that people often overlook simpler sources of vitamin D: fatty fish, egg yolks, fortified milk, and even brief outdoor exposure. Spending 15 to 20 minutes outside a few times a week, even on cloudy days, can help maintain adequate levels. People with darker skin require longer sun exposure to produce the same amount of vitamin D as those with lighter skin, a fact that affects how the general guidance applies across different populations.
The NHS guidance itself acknowledges these alternatives. Health boards have advised residents that outdoor time—as little as 30 minutes daily—can boost vitamin D levels, and that foods like oily fish, liver, mushrooms, red meat, cheese, and fortified spreads and cereals all contribute. For those who qualify for the Healthy Start scheme, free supplements containing vitamin D are available. For others, low-cost options are widely available at pharmacies and supermarkets.
Najam's broader point extends beyond vitamin D itself. He framed supplementation as a supporting measure, not a primary intervention. The things that actually move the needle on cardiovascular health and overall wellness—movement, sleep, stress management—deserve more attention than mega-dosing a single nutrient. Vitamin D has a role, but it is not the star of the show. The practical takeaway is straightforward: get tested before October arrives. If you're low, supplement. If you're normal, focus your energy elsewhere. It's a reminder that even well-intentioned public health advice benefits from a closer look at individual circumstances.
Citas Notables
If you're genuinely deficient, and I mean actually tested and not guessing, then yes, supplementing makes sense. But if you're already at a healthy level, taking more doesn't give you extra protection; it just sits there.— Dr Osman Najam, consultant cardiologist
Vitamin D is a supporting player, not the star. Focus on movement, sleep, and stress management for cardiovascular health.— Dr Osman Najam
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