Stronger bones and strength training -- does it help?
Strength training measurably improves bone density, although the effect remains modest. For the strongest results, high-intensity training under supervision is recommended, even if you already have low bone mass.
Strength training increases bone mineral density, but the effect is modest. A meta-analysis and systematic review of dozens of studies show that bone density at trained sites increases by roughly 1 to 3 percent. That effect is larger at the spine than at the hip. Not every study finds the same result, and it remains unclear whether those bone gains actually translate into fewer fractures: a Cochrane review of 43 randomised studies found no statistical evidence for that, probably because the individual studies were too small and too short.
The heavier the load, the greater the effect appears to be. In the LIFTMOR trial, a randomised study involving 101 postmenopausal women with a mean age of 65, participants trained twice a week at high intensity under supervision. After 8 months, bone density in the spine rose by 2.9 percent, while the control group lost 1.2 percent. At the femoral head the difference was even greater: +0.3 percent versus -1.9 percent. Women who already had low bone mass (osteopenia or osteoporosis) also benefited. There was only one adverse event: a mild muscle cramp in the back. Ordinary walking does not reach that level: walking alone slows bone loss but does not build bone mass.
People who already have advanced bone loss do not necessarily need to avoid heavy lifting. The LIFTMOR trial shows that training at high intensity can be safe when it is carried out under expert supervision and the person is otherwise healthy. Without supervision, or in the presence of other health problems, caution is appropriate, because this is still just one study.
Creatine supplementation on top of strength training provided an additional benefit in one randomised 12-month study of postmenopausal women: the creatine group lost 1.2 percent of hip bone density, while the placebo group lost 3.9 percent. The femur also widened slightly, which may improve fracture resistance. No liver or kidney problems were found. Nevertheless, this is one study, and it is too early to recommend creatine as a standard bone intervention.
The strongest evidence for bone health applies to the earliest phase of life. Being physically active as a child and teenager builds peak bone mass, and that bone reserve determines 20 to 40 percent of how vulnerable your bones become later in life. Calcium and vitamin D support this process. Those who missed that window can still gain something through strength training in adulthood, but they cannot recover the early advantage.
Based on one meta-analysis/systematic review (PMID 21735380), two additional systematic reviews (PMID 9927006, 26856587), three RCTs (PMID 23287836, 25386713, 28975661) and two non-indexed reviews (PMID 22777332, 30671455). Fracture effect not demonstrated in randomised studies; bone density effect demonstrated but small.
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.
Do you really need calcium supplements for strong bones?
Whether you need calcium supplements depends strongly on your age and circumstances: for young, healthy women there is no evidence of benefit, while people over 50 may benefit from calcium plus vitamin D, provided the increased risk of kidney stones is taken into account.
Does strength training help against osteoporosis?
Strength training demonstrably helps against osteoporosis: it increases bone density by one to three percent and also reduces the risk of falling. Supervised heavy training (above 85% of your maximum) produces the strongest effect, even if you already have osteoporosis.
How do I know whether my bones are strong enough (osteoporosis)?
With a DXA scan and, if needed, a FRAX risk calculation, you can have your GP check whether your bones are strong enough -- especially if you have risk factors or have already broken a bone from a minor fall.
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.
How do I keep my bones strong after menopause?
You can protect your bones well after menopause with lifestyle measures and, depending on your risk, with medication. If you have risk factors, get a bone density scan done and discuss the options with your doctor.