Women who want to strengthen their bones, especially after menopause, should supplement with potassium citrate for 12 months. It's proven to improve bone mineral density, and it's a great way of countering the acid-producing effects of the standard Western diet.
A group of 161 postmenopausal women supplemented with potassium citrate, and there was a significant improvement in bone mineral density in the neck and hips.
Potassium citrate is an alkaline compound that stops the leaching of calcium from bones. Aside from supplements, you can also counter the worst effects of the standard diet by eating more fruits and vegetables.
(Source: Townsend Letter, 2008; 294: 53).