running 90mpw, Should I take calcium supplements if I've never had a stress fracture?

It's likely that whatever calcium you supplement your diet with will just get pissed out. Of course this is with no knowledge of your current diet, just a generalization. Most people don't get enough calcium because they ingest too much caffeine and protein and not enough vitamin c.

would i be at risk for kidneystones tho if i did take it?

bump

I take one because I am lactose intolerant and don't drink milk or eat cheese or yogurt or any other dairy products. I haven't had any problems with it.

No. Calcium does not help build bone density. Calcium supplements will do more harm than good. The whole calcium for bones thing is a MYTH that has never been proven. The calcium supplements are essentially chalk (calcium bicarbonate)

The body builds bone from magnesium, silica and phosphorus NOT calcium.

Avoid calcium supplements at all costs. Unless you want a heart attack.

5/10

Hmm. You sure about that?

The inorganic composition of bone (bone mineral) is formed from carbonated hydroxyapatite [6][7] (Ca10(PO4)6OH2) with lower crystallinity.[6][8] The matrix is initially laid down as unmineralised osteoid (manufactured by osteoblasts). Mineralisation involves osteoblasts secreting vesicles containing alkaline phosphatase. This cleaves the phosphate groups and acts as the foci for calcium and phosphate deposition. The vesicles then rupture and act as a centre for crystals to grow on. More particularly, bone mineral is formed from globular and plate structures,[9][10] distributed among the collagen fibrils of bone and forming yet larger structure.

BTW OP there's no need for calcium supplements. Just eat a healthy diet and don't get into crazy weight loss schemes. The only thing I've found difficult to maintain while running high mileage is iron levels. You've either got to eat a lot of red meat or take supplements.

Hydroxylapatite (Ca5(PO4)3(OH), but is usually written Ca10(PO4)6(OH)2) makes up seventy percent of bone. Also carbonated-calcium deficient hydroxylapatite is the main mineral of which dental enamel and dentin are comprised.