What does magnesium do for your bone strength?
Getting enough magnesium appears to be good for your bones, but whether supplements truly prevent fractures has not yet been convincingly demonstrated. First make sure your intake through diet is in order; consider supplementation only if you know you are deficient, and discuss this with your doctor if in doubt.
About 1 in 5 people consistently take in less magnesium than recommended. This is associated with lower bone density and a higher risk of fractures. People with low magnesium levels in the blood more often have osteoporosis: in women after menopause, this applied to 30 to 40 percent of those studied. These are associations, not proven cause and effect.
Eating more magnesium goes along with slightly higher bone density in the hip and the femoral neck joint. The association is weak, however. No significant association was found for the lumbar vertebrae, and eating more magnesium did not demonstrably lead to fewer fractures in the studies.
Seven intervention studies with magnesium supplementation (dosages ranging from 250 to 1800 mg) all showed a positive effect on bone density. That is encouraging, but the studies are small and the dosages vary widely, so firm recommendations cannot yet be made. A small study in postmenopausal women showed a measurable increase in bone density after two years of magnesium hydroxide and suggested that fractures were prevented, but that too remains indicative for now.
Biologically, there is a clear reason to assume that magnesium matters for your bones: it plays a role in calcium transport and directs the cells that both build and break down bone. Studies in older adults also show a positive association between magnesium intake and bone density in the hip, although there is still too little research on other bone sites.
Combinations of magnesium with calcium, vitamin D, or vitamin K2 are regularly studied and may possibly be more effective than magnesium alone, but the individual contribution of magnesium is difficult to isolate from those combinations. No firm conclusions can yet be drawn about this.
This answer is based on multiple analyses of existing studies (including an analysis of twelve studies on magnesium intake and bone density) and a handful of intervention studies. Most of the evidence is based on associations in people followed for many years, not on research in which someone was randomly assigned to a group. The seven intervention studies with supplementation are too small and too diverse in design for firm conclusions. Large, long-running studies of magnesium supplementation in older adults are still lacking.
Does omega-3 (fish oil) have an effect on bone strength?
Omega-3 does not appear to improve bone density in older adults; for bone preservation, it is better to focus on adequate calcium and vitamin D, ideally in consultation with your doctor.
Can zinc contribute to stronger bones?
Getting enough zinc through your diet is likely important for your bone health, but whether extra zinc supplementation truly helps if you have no deficiency is not yet well substantiated. Make sure your daily intake does not fall below 3 mg, and discuss supplements with your doctor if you are uncertain about a deficiency.
Does being overweight affect your bone density?
Being overweight does not straightforwardly increase bone density, and the location and amount of fat strongly determine whether the skeleton benefits or is harmed. If you are considering losing weight, do so gradually and combine it with strength training to limit bone loss.
Which supplements are proven to help strengthen bones?
For bone strengthening, the combination of calcium and vitamin D is the best supported by evidence, especially in cases of deficiency or elevated fracture risk. Vitamin K2 shows encouraging results in postmenopausal women, but discuss the right dose and combination with your doctor, as too much of any supplement also has downsides.
Does magnesium really help you sleep better and keep your mind sharp?
Magnesium may help with sleep problems, but the evidence is still too limited and inconsistent to make firm claims. If you want to try it, supplements at normal doses are safe; in any case, make sure you get enough through your diet.
How much magnesium do you need per day?
For an average-weight adult, the guideline is approximately 250 mg of magnesium per day from food; if you cannot reach that through spinach, nuts and whole grains, a supplement of up to 600 mg per day can help as a top-up.