Treatments for osteoporosis include calcium and vitamin D supplementation, medications to help preserve calcium, hormone replacement, and exercise. 
Vitamin D.
Hope this helps!
Can u plz mark me as brainliest? I really need it!
        
             
        
        
        
It is (B) it is strange but it does weaken the immune system 
 
        
                    
             
        
        
        
The correct answer to this question is b because 1.writing and 2l.earn  are both verbs