Dr. Brown’s 20 Key Nutrients are an Important Part of Your Supplement Protocol
Quick Answer: Bone health requires a team of nutrients, not a single supplement. The foundational bone nutrients include Calcium (from food first), Vitamin D3, Vitamin K2 as MK-7, Magnesium, and Boron. Dr. Brown recommends these in their most bioavailable forms alongside an alkaline-forming diet — because no supplement outperforms good nutrition.
With hundreds of bone health supplements on the market, it can be overwhelming to know what you actually need. Dr. Susan Brown, PhD — New York State Certified Nutritionist and bone health researcher with 40+ years of clinical experience — cuts through the confusion with research-based guidance on the most effective supplements for building and maintaining strong bones.
Frequently Asked Questions
No single supplement is “the best” — effective bone health requires a team of nutrients working together. The foundation includes: Calcium (ideally from food, supplemented as needed), Vitamin D3 (for calcium absorption), Vitamin K2 as MK-7 (to direct calcium into bones), Magnesium (to activate vitamin D and support bone structure), and Boron (to enhance mineral retention). Dr. Brown’s Better Bones Builder formula is designed to provide all these nutrients in their optimal forms and ratios.
Should I take calcium citrate or calcium carbonate?
Calcium citrate is generally preferred for most people, especially those over 50, because it does not require stomach acid for absorption and can be taken with or without food. Calcium carbonate is less expensive and has a higher percentage of elemental calcium, but requires stomach acid to be absorbed well — which decreases with age. Important: always take calcium with vitamin K2 and D3, and avoid taking more than 500-600 mg of calcium at one time for best absorption.
What is the best form of vitamin D for bone health?
Vitamin D3 (cholecalciferol) is the preferred form — it is the same form produced by your skin in sunlight and raises blood vitamin D levels more effectively than vitamin D2 (ergocalciferol). For bone health, most adults need 1,000-5,000 IU of D3 per day, though the right dose depends on your current blood level. Testing your vitamin D level (25-OH vitamin D blood test) is the best way to personalize your dose.
How does vitamin K2 help bones — and which form is best?
Vitamin K2 activates osteocalcin, a protein produced by bone-building cells that binds calcium to the bone matrix. Without K2, calcium can be absorbed but floats in the bloodstream where it may deposit in arteries instead of bones. K2 also activates Matrix GLA Protein (MGP), which prevents arterial calcification. The MK-7 form is preferred because it has a longer half-life in the body and is more bioavailable than MK-4. Effective doses range from 90-200 mcg daily.
Is magnesium important for bone density?
Absolutely — magnesium is involved in over 300 enzymatic reactions and is essential for activating vitamin D (without enough magnesium, vitamin D cannot function properly). About 50-60% of your body’s magnesium is stored in bone. Studies show that higher magnesium intake is associated with greater bone density. Many Americans are deficient in magnesium due to modern diets and depleted soils. Magnesium glycinate and magnesium malate are well-absorbed forms that are gentle on digestion.
What is boron and why does it help bones?
Boron is a trace mineral that plays several important roles in bone health: it enhances the retention of calcium and magnesium, supports the metabolism of vitamin D, and may help maintain estrogen levels after menopause. Research shows that boron deficiency leads to increased calcium loss. Good food sources include prunes, raisins, apricots, and avocado. A supplemental dose of 3-6 mg daily is generally recommended for bone health.
Strontium is a mineral that is chemically similar to calcium and can be incorporated into bone tissue, where it may stimulate bone formation and inhibit bone resorption. Some research supports its use for improving bone density. Dr. Brown recommends natural strontium citrate (not the drug strontium ranelate, which is not available in the US) in a dose of 340-680 mg per day, taken separately from calcium since they compete for absorption. It should be used as part of a complete bone program, not as a standalone.
See Dr. Brown’s own Better Bones supplement formulations. Learn more →
How To: Step-by-Step Guide
A step-by-step guide to selecting, prioritizing, and using bone health supplements effectively, based on Dr. Susan Brown’s nutritional framework developed over 40+ years of clinical practice.
- Assess your diet for nutrient gaps first
Before supplementing, evaluate how much calcium, Vitamin D, and Magnesium you are actually getting from food. Most people overestimate their dietary intake. An alkaline-forming whole-food diet reduces how much supplementation you need.
- Test your Vitamin D level
Get a 25-OH Vitamin D blood test before supplementing. Most people in North America are deficient. The optimal range for bone health is generally 40–60 ng/mL. Your dose should be calibrated to your actual level.
- Select the right forms of each nutrient
Form matters enormously for absorption. Choose Vitamin D3 (not D2), Vitamin K2 as MK-7 (not MK-4), Magnesium glycinate or malate (not oxide), and Calcium from food-based sources. Poorly absorbed forms may provide little real benefit.
- Take bone nutrients as a synergistic team
Calcium, Vitamin D3, Vitamin K2, and Magnesium must be taken together — each enables the others to function properly. D3 increases calcium absorption; K2 directs calcium into bone; Magnesium activates D3. No single supplement replaces the full team.
- Avoid megadosing isolated calcium
High-dose calcium supplements taken without adequate K2, D3, and Magnesium may contribute to arterial calcification rather than bone building. Prioritize food-based calcium and use supplements only to bridge the gap.
- Reassess your program every 6 to 12 months
Repeat nutrient testing (especially Vitamin D), track any DEXA scan changes, and review your supplement program with a knowledgeable practitioner at least annually. Bone health supplementation is not one-size-fits-all.
