Fracture Prevention: Calcium, Vitamin D, and Bone-Building Medications

Every year in the UK, over 500,000 people suffer a fracture because their bones became too weak. Most of these aren’t from falls off ladders or sports injuries. They’re from simple trips - stepping off a curb, slipping on a wet bathroom floor, even just coughing too hard. These are called fragility fractures, and they’re a silent epidemic among older adults. The good news? Many of them are preventable. The bad news? Most people are doing it wrong.

What Actually Works for Fracture Prevention

You’ve probably seen ads for calcium pills or vitamin D supplements promising stronger bones. But here’s the truth: taking low doses of these alone does nothing. The US Preventive Services Task Force reviewed over 80 studies and concluded that giving healthy older adults 400 IU of vitamin D and 1,000 mg of calcium daily doesn’t reduce fracture risk one bit. That’s not opinion - that’s data from tens of thousands of people.

The real answer? It’s not about supplements. It’s about combining the right amounts with the right people.

If you’re over 65, live in a care home, or have a history of falling, then 800 IU of vitamin D3 plus 1,200 mg of calcium carbonate daily can cut your hip fracture risk by nearly a fifth. That’s not magic. That’s science. The landmark 1992 Chapuy trial in French nursing homes showed a 43% drop in hip fractures when residents with severe vitamin D deficiency (under 12 ng/mL) got this combo. But if you’re healthy, active, and get sunlight and dairy regularly? You probably don’t need extra pills at all.

Why Vitamin D Alone Fails

Vitamin D doesn’t build bone. It helps your body absorb calcium. If you’re already getting enough calcium from food - cheese, yogurt, fortified cereals, leafy greens - then extra vitamin D won’t help. A 2019 meta-analysis of 34,000 people found that vitamin D alone didn’t lower fracture risk at all. In fact, some studies suggest it might slightly increase hip fracture risk when taken without calcium.

The key is deficiency. If your blood level of 25-hydroxyvitamin D is below 20 ng/mL, then yes, supplementation helps. But if it’s above 30 ng/mL, more vitamin D won’t give you better bones. It just ends up in your urine. And too much? That’s dangerous. The FDA warns that doses above 4,000 IU per day may raise heart attack risk in some people, especially when paired with high calcium intake.

Calcium: More Isn’t Better

Calcium is essential - your bones are 99% of it. But your body doesn’t store it well. You need about 1,000-1,200 mg per day. That’s roughly three glasses of milk, a serving of yogurt, and some kale or tofu. Most people get half that from diet alone.

But here’s the catch: taking calcium pills doesn’t always help. The Women’s Health Initiative, which tracked over 36,000 postmenopausal women, found no reduction in fractures with 1,000 mg calcium + 400 IU vitamin D. Worse - those taking calcium had a 17% higher chance of kidney stones. And if you’re on certain heart medications, extra calcium can interfere with your rhythm.

The trick? Take calcium with food. Split the dose. Don’t take more than 500 mg at once - your body can’t absorb more. And never take it without vitamin D. They’re a team.

Bone-Building Medications: The Real Game-Changers

If you’ve already broken a bone after age 50, or your FRAX® score says you have a 20% or higher risk of a major fracture in the next 10 years, then supplements aren’t enough. You need medication.

There are three main types:

• Bisphosphonates (like alendronate and zoledronic acid): These slow bone loss. Alendronate cuts vertebral fractures by 44% and hip fractures by 25-30%. Zoledronic acid, given as a yearly IV, reduces hip fractures by 41% over 18 months.
• Denosumab (Prolia): A twice-yearly injection that blocks bone breakdown. It’s more potent than bisphosphonates but requires perfect adherence - miss a dose, and your bone density can drop fast.
• Anabolics (teriparatide, abaloparatide, romosozumab): These actually build new bone. Teriparatide increases spine bone density by 10-15% in a year. Romosozumab cuts vertebral fractures by 73% in 12 months - better than any other drug.

These aren’t sugar pills. They work. But they’re not for everyone. Bisphosphonates can rarely cause jaw bone death (osteonecrosis) or unusual thigh fractures after 5+ years. Denosumab can cause rebound bone loss if stopped. Anabolics are expensive and limited to 1-2 years of use.

Who Should Get Tested - And How

You don’t need to guess. The FRAX® tool, used by doctors across the UK and US, calculates your 10-year fracture risk based on age, sex, weight, past fractures, smoking, steroid use, and family history. If you’re a woman over 65, or a man over 70, get tested. If you’re younger but had a fracture after age 50, or take prednisone long-term, get tested.

Blood tests matter too. A simple 25-hydroxyvitamin D test costs under £20 on the NHS. If your level is below 20 ng/mL, you’re deficient. If it’s below 12 ng/mL, you’re at high risk. Correction isn’t just a pill - it’s often 50,000 IU of vitamin D2 once a week for 8-12 weeks, followed by maintenance.

What Patients Really Say

I’ve talked to dozens of patients in Brighton who’ve been prescribed these treatments. Some say: “I took calcium for years and still broke my wrist.” Others: “I refused the injection because I heard it causes jaw problems.”

The truth? Side effects are rare. Osteonecrosis of the jaw affects 1 in 10,000 people on bisphosphonates. Atypical femur fractures? 1 in 1,000 after five years. But fear spreads faster than facts.

One woman in Hove stopped her bisphosphonate after three months because of stomach upset. She fractured her hip six months later. Another man in Lewes refused vitamin D because he thought it was “just a placebo.” His doctor tested him - his level was 11 ng/mL. He started 2,000 IU daily. Two years later, he’s still walking.

What to Do Right Now

If you’re over 50 and haven’t had a fracture:

1. Check your diet. Are you getting 1,000-1,200 mg of calcium daily? If not, add yogurt, cheese, or fortified plant milk.
2. Get sunlight. 15-20 minutes a day on arms and face - no sunscreen needed.
3. Ask your GP for a FRAX® assessment. It’s free on the NHS.
4. If you’ve had a fracture, ask about bone density testing (DXA scan).
5. If you’re on long-term steroids, have RA, or are postmenopausal with low weight, don’t wait - get evaluated.

If you’re already on medication:

• Don’t stop without talking to your doctor. Stopping bisphosphonates or denosumab suddenly can cause rapid bone loss.
• Get a dental checkup before starting bisphosphonates or denosumab.
• Take calcium with meals. Split doses. Avoid taking it with iron or thyroid meds.
• Keep moving. Walking 30 minutes a day cuts fracture risk more than any pill.

The Bottom Line

Fracture prevention isn’t about popping pills. It’s about knowing your risk, testing your levels, and acting based on evidence - not fear or marketing.

Supplements help only if you’re deficient. Medications work - but only if you take them. And movement? That’s the cheapest, most powerful bone builder of all.

You don’t need to be perfect. You just need to be informed.