Nov '25 • General discussion
Vitamin D & K2: The Dynamic Duo for Strong Bones and a Healthy Heart
I remember a number of years ago, shortly after I qualified in Nutritional Medicine, I took a Vitamin D test offered by the NHS Black Country Pathology Service. They’d been recommended by other Nutritional Therapists, so I decided to check my own levels — feeling quite smug, as I always ensure I get plenty of sunshine during the summer months.
However, I was shocked when my results showed that I was actually deficient! And interestingly, I’d also recently been diagnosed with osteopenia — in my 40s.
Just today, my best friend left me a voice message after getting some blood results back from her GP. Amazingly, they’d tested her Vitamin D levels (rare in the UK, as it’s not routinely offered!) and it’s turned out she’s severely deficient. She’s in her 50s and works in a physically demanding cleaning job at an AirB&B site, so she assumed her fatigue and aches were just part of that. Her GP prescribed a high-dose course of Vitamin D — and that was that.
Some people won’t notice any symptoms, but many do. Here’s a list:
- Aching bones or joints (often mistaken for arthritis)
- Muscle weakness, heaviness, or cramps
- Lower back pain
- Increased risk of fractures or slower healing after breaks
- Osteopenia or osteoporosis
😴 Energy & Mood
- Persistent fatigue or low energy, even after good sleep
- Low mood or symptoms of depression
- Feeling sluggish or “flat” in the winter months
- Poor motivation or brain fog
💪 Immune Function
- Getting colds, flu, or infections more often
- Slower recovery from illness
- Increased susceptibility to respiratory infections
😬 Other Possible Signs
- Hair loss or thinning
- Wounds that take longer to heal
- Dental issues (weak teeth, gum problems)
- Trouble sleeping or poor sleep quality
- Weight gain or difficulty losing weight
But here’s the thing: when taking Vitamin D, there’s another nutrient we really need to think about. Let me explain.
Why Vitamin D Matters
Vitamin D plays a leading role in helping your body absorb calcium — the mineral that keeps your bones strong and your muscles functioning properly. Without enough Vitamin D, even a calcium-rich diet won’t do much good, because the calcium won’t be absorbed efficiently into your bloodstream.
Low Vitamin D levels are common, especially in countries like the UK where sunlight is limited for much of the year. Symptoms can include fatigue, low mood, muscle weakness, and a greater risk of osteoporosis or bone loss.
The Missing Link: Vitamin K2
Here’s where Vitamin K2 steps in. Once Vitamin D helps your body absorb calcium, K2 decides where that calcium goes. It activates special proteins that guide calcium into your bones and teeth — and keeps it out of places it shouldn’t be, like your arteries and soft tissues.
Without enough K2, calcium can build up in the arteries, contributing to stiffness or even calcification — the opposite of what you want for long-term health. That’s why many functional nutrition experts now refer to Vitamin D and K2 as a “team nutrient combination.”
Together Is Better
Think of Vitamin D as the “door opener” — it helps calcium enter the bloodstream. Vitamin K2 is the “traffic controller” — it directs that calcium to the right destination.
When taken together, they:
- Support bone density and strength
- Protect cardiovascular health by preventing calcium buildup in arteries
- Protects joints by preventing calcium build-up in the joints
- Improve overall mineral balance in the body
How to Take Them
Many high-quality Vitamin D3 supplements now include K2 (often in the MK-7 form, which stays active longer in the body). For most adults, a daily Vitamin D3 + K2 supplement is a safe and effective combo, especially during darker months when sun exposure is limited.
If you’re on blood-thinning medication, ensure you keep the dose of K2 at a moderate level. Products I have recommended are safe to use as they are at lower levels).
The Bottom Line
Vitamin D and K2 are like the perfect wellness partnership — one helps you absorb calcium, the other makes sure it ends up in your bones, not your arteries. Together, they’re a smart, natural way to support bone and heart health, especially as we move through midlife and beyond.
Here are my recommendations for you to action right now:
1 Get yourself tested NHS Black Country Pathology Service (£31 and the test I use everytime I test) or ask your GP (but it’s unlikely they will agree)
2 After your test results come in, feel free to contact me for more support and information. If you’re not going to take the test, then over the winter months, I would recommend you take a supplement daily.
Here are my recommendations and products I use myself.
I order from a company in the UK called The Natural Dispensary
I have a practitioner account and if you use JTRLG10 in the client discount field, you’ll
get 10% Discount. You can use the discount for any other products they sell too.
Cytoplan D3 and K2 60 capsules
Price £23.49 – 60 capsules - @ once a day, these will last 2 months.
Take 1 capsule a day with a meal that contains some fat as this will help with
absorption.
If you are unable to get the above, there is a lower dose sold by Viridian - D3 and K2
Price £30.05 – 90 capsules (this is a lower dose) and will last for 3 months.
Take 1 capsule a day with a meal that contains some fat as this will help with
absorption.
I realise some of you are not in the UK. If you’d like me to make other suggestions for your country, please comment below.
If you have any questions about these or would like me to discuss other supplements etc, just let me know in the comments or you can DM me.
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Vitamin D & K2: The Dynamic Duo for Strong Bones and a Healthy Heart
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