Nutrition and bone health
What you eat every day has a direct effect on your bones. Calcium, vitamin D and protein are essential, but the right combination is individual. At OSAIA we give you dietary advice tailored to your situation.
Why supplements matter for bone health
Although a balanced diet is the foundation of bone health, many people find it hard to get enough bone-supporting nutrients from food alone. This is where good-quality supplements can play an important role.
Vitamin D deficiency is very common, especially in northern climates and among people who spend little time outdoors. Calcium intake often falls below the recommended level, especially in older adults and people who avoid dairy products.
Supplements can help fill these nutritional gaps, but it is important to choose the right products, take the right doses and use them as part of an overall plan for bone health.
Supplements that strengthen your bones
Based on scientific evidence, not guesswork.
Vitamin D (D3)
800–2,000 IU daily
Essential for calcium absorption and normal bone mineralisation. Most people with osteoporosis need this supplement.
Key benefits
- Increases calcium absorption by 30–40%
- Supports bone density and strength
- Reduces fall risk through better muscle strength
- Helps keep parathyroid hormone at a normal level
Take vitamin D with a meal that contains fat, so it is absorbed better, and have your blood level checked regularly at OSAIA.
Calcium
1,000–1,200 mg/day in total
The most important mineral for your bones. A supplement is recommended if you do not get enough from your diet alone.
Key benefits
- Maintains the mineral content and density of the bones
- Helps prevent accelerated bone loss
- Supports muscle and nerve function
- Needed for normal blood clotting
Split your daily dose: no more than 500 mg at a time, for the best absorption. Calcium citrate can be taken with or without food, while calcium carbonate needs a meal.
Vitamin K2
90–120 mcg daily
Helps calcium reach the bones and keeps it from settling in the blood vessels. It works together with vitamin D for the best effect.
Key benefits
- Activates proteins that bind calcium to bone
- Reduces the risk of calcium deposits in the blood vessels
- Improves bone quality and strength
- May reduce the risk of fractures
Choose the MK-7 form. It is absorbed better and stays active in the body for longer. Vitamin K2 is often combined with D3 in supplements, because the two vitamins work best together.
Magnesium
300–400 mg daily
Essential for converting vitamin D into its active form and for maintaining a healthy bone structure. Magnesium deficiency is more common than most people think.
Key benefits
- Activates vitamin D metabolism
- Helps regulate calcium and potassium
- Supports the formation of bone crystals
- Influences parathyroid hormone
Choose magnesium glycinate or magnesium malate. Both are absorbed better than ordinary magnesium oxide. Start with a low dose and increase it gradually to avoid stomach upset.
Choose quality supplements
What to look for when you choose supplements for bone health.
Third-party testing
Look for USP, NSF or another certified laboratory approval, so you can be sure of the quality and the dose.
Easily absorbed forms
Choose D3 (not D2), calcium citrate (absorbed better) and K2 as MK-7.
The right doses
Stick to the recommended doses. More is not always better, and it can cause side effects.
Few additives
Choose products with fewer fillers, binders and artificial ingredients.
Check the expiry date
Supplements lose potency over time. Buy fresh products and store them correctly.
Consider combination products
Some products combine D3, K2 and calcium, which is convenient and lets the nutrients work together.
Get more from your supplements
When and how to take your supplements for the best result.
Morning
D3 + K2 with breakfastWhy: Fat-soluble vitamins are absorbed best with fat from food
Tip: Take them with eggs, avocado or yoghurt for the best absorption
Midday
Calcium (first dose) with lunchWhy: Spread your calcium intake across the day so more of it is absorbed
Tip: No more than 500 mg per dose. Take the rest with dinner
Evening
Calcium (second dose) + magnesium with dinnerWhy: Magnesium can help you relax, and calcium supports the bone remodelling that happens overnight
Tip: Take it at least 2 hours apart from iron or zinc supplements
Not sure you are getting enough calcium?
The calcium calculator in the OSAIA app does more than show your daily calcium intake. It also helps you see what affects absorption. Some foods and habits help the body absorb calcium, and others get in the way. The calculator explains both, so you can make better choices for your bones.
Read more about OSAIA AppDiet and bone health: we will guide you
Eating well for your bones does not have to be complicated. OSAIA offers tools, supplements and expert guidance that make it straightforward.
Consultation with our clinical dietitian
Work one to one with our clinical dietitian, Helle, for personal nutrition guidance tailored to your bone health, lifestyle and calcium needs.
DKK 69930 min
- A personal calcium and vitamin D assessment
- A nutrition plan tailored to your bone health
- Supplement recommendations based on your diet
- Practical advice on planning meals
OSAIA Plus
For you if you want to be sure you are getting the right support without having to think about it.
MonthlyYearlyDKK 149/month
- Calcium and vitamin D from Pharma Nord, delivered to your home when you need it
- A vitamin D home test, twice a year
- Personal guidance on diet and supplements by chat with our advisers
- Unlimited use of the AI calcium calculator
Frequently asked questions
Answers to the questions we hear most often about diet and supplements.
Can I get enough calcium and vitamin D from food alone?
Supplements support your diet. They do not replace it. Calcium is the most important mineral for your bones, and a supplement is recommended if you do not get enough from food alone. Most people with osteoporosis also need a vitamin D supplement, which is essential for calcium absorption.
What time of day should I take my supplements?
Take vitamin D with a meal that contains fat. Fat-soluble vitamins are absorbed best with fat from food, for example eggs, avocado or yoghurt. Split calcium across the day, with no more than 500 mg at a time. Calcium citrate can be taken with or without food. Calcium carbonate needs a meal.
Which form of supplement should I choose?
Choose D3 rather than D2, and calcium citrate rather than calcium carbonate, because it is absorbed better. Choose K2 in the MK-7 form, which the body can use more readily and which stays active for longer. Magnesium glycinate or magnesium malate is absorbed better than magnesium oxide. Look for USP, NSF or another certified laboratory approval.
What do vitamin K2 and magnesium do for the bones?
K2 helps calcium reach the bones and keeps it from settling in the blood vessels. It works together with vitamin D. Magnesium is essential for converting vitamin D into its active form and for maintaining a healthy bone structure, and deficiency is more common than most people think.
Can you take too much?
Stick to the recommended doses. More is not always better, and it can cause side effects. Choose products with fewer fillers, binders and artificial ingredients, and buy fresh products, because supplements lose potency over time. Have your blood levels checked regularly at OSAIA.
Keep reading
Explore related topics to get a better understanding of bone health.
Ready to take charge of your bone health?
Join the hundreds of other patients who have chosen OSAIA on the way to better bone health. Start by booking a free pre-assessment. There is no obligation and no waiting list.
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