( ( Although ( ( lack ( of calcium ) ) ( can ( cause osteoporosis ) ) ) ) ( , ( ( ( ( taking ( extra calcium ) ) , ) ( by itself ) ) ( , ( ( ( does not ) ( treat osteoporosis ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (NP (NN lack)) (PP (IN of) (NP (NN calcium)))) (VP (MD can) (VP (VB cause) (NP (NNS osteoporosis)))))) (, ,) (S (VP (VBG taking) (NP (JJ extra) (NN calcium)) (, ,) (PP (IN by) (NP (PRP itself))))) (, ,) (VP (VBZ does) (RB not) (VP (VB treat) (NP (NNS osteoporosis)))) (. .)))
Although lack of calcium can cause osteoporosis, taking extra calcium, by itself, does not treat osteoporosis.
(ROOT (S (NP (RB Too) (JJ little) (NN calcium)) (VP (MD can) (VP (VB cause) (NP (DT the) (NN disease) (NN osteoporosis)))) (. .)))