Vitamin D Deficiency Symptoms: How to Spot and Fix Them

When you think about vitamins that are absolutely essential for good health, Vitamin D should be right at the top of the list. It’s sometimes called the “sunshine vitamin” because our bodies naturally make it when our skin is exposed to sunlight. But here’s the thing: despite being one of the easiest vitamins to get (in theory), Vitamin D deficiency is surprisingly common.

In fact, studies suggest that around 1 in 6 adults in the UK may have low Vitamin D levels, and the numbers rise during the darker autumn and winter months. If you’ve been feeling a little more tired, achy, or “not yourself” lately, it might not just be the weather, it could be low Vitamin D.

The Role of Vitamin D in Your Body

Vitamin D isn’t just about strong bones (though it does that really well by helping you absorb calcium). It also:

• Supports your immune system
• Helps regulate mood and mental wellbeing
• Keeps your muscles and nerves working properly
• Contributes to heart and metabolic health

And when you pair it with Vitamin K2 (like in our My Dailys D3 + K2), you get extra benefits: K2 helps guide calcium to where it belongs (your bones and teeth) and away from where it doesn’t (your arteries).

Common Symptoms of Vitamin D Deficiency

Low Vitamin D can show up in sneaky ways. Here are the most common symptoms to look out for:

1. Low Energy and Fatigue – Constant tiredness even with decent sleep.
2. Bone or Muscle Pain – Achy muscles, joint discomfort, or dull soreness.
3. Weaker Immunity – Picking up every cold that goes around.
4. Mood Changes – Feeling low, flat, or less motivated than usual.
5. Slow Wound Healing – Cuts and scrapes taking longer to recover.
6. Hair Loss or Thinning – Severe deficiencies can sometimes play a role.

These symptoms can overlap with other issues too, so it’s not always straightforward. The best way to know for sure is through a blood test, but these warning signs are good clues to pay attention to.

Who’s Most at Risk of Vitamin D Deficiency?

• People who spend most of their time indoors
• Those with darker skin (as melanin reduces Vitamin D production)
• Anyone living in northern climates (like the UK, especially in winter)
• Older adults (our skin makes less Vitamin D as we age)
• People who cover their skin for cultural or religious reasons
• Vegans/vegetarians, since few plant foods naturally contain Vitamin D

How to Fix Low Vitamin D

The good news? Deficiency is usually easy to fix:

• Get Some Sun ☀️ – 10–20 minutes of midday sun exposure a few times per week can help. But in the UK, between October and April, the sun isn’t strong enough.
• Eat Vitamin D-Rich Foods 🥚🐟 – Oily fish, egg yolks, and fortified foods can give your levels a boost.
• Take a Supplement 💊 – A reliable way to maintain healthy levels year-round. A Vitamin D3 + K2 supplement (like our My Dailys blend) ensures your body absorbs and uses it effectively.

The Bottom Line

Vitamin D deficiency is more common than most people realise, and the symptoms can creep up quietly—low energy, achy muscles, frequent illness, and changes in mood are just a few of the red flags.

The fix? A mix of sunlight, diet, and smart supplementation. By topping up with Vitamin D3 + K2 daily, you’ll be giving your body the support it needs to thrive. No matter the season.

FAQs About Vitamin D Deficiency

1. How do I know if I’m Vitamin D deficient?
The most accurate way is through a blood test, but common symptoms include fatigue, bone/muscle pain, and frequent illness.

2. How much Vitamin D should I take daily?
Public Health England recommends 10 micrograms (400 IU) per day for adults. Some people may benefit from higher doses, but always follow supplement guidelines.

3. Can you get enough Vitamin D from food alone?
It’s possible, but difficult, especially in the UK. That’s why many people benefit from a supplement.

4. What’s the difference between Vitamin D2 and D3?
D3 is the more effective form for raising blood levels of Vitamin D.

5. Why pair Vitamin D3 with K2?
Because K2 helps direct calcium into your bones instead of arteries, making the combo better for long-term bone and heart health.