Dandruff occurs when your scalp is dry - there's not enough natural oil that your body produces. There can be several reason for that:

• You’re stressed out
• Common yeast called pityrosporum orbiculare, which feeds on skin oils
• You are not rinsing your hair thoroughly
• You are not eating healthy - avoid trans fats(fast food)
• Lack of nutrients like fatty acids and vitamin B
• Excess alcohol consumption

I haven't tried any home remedies, because every time i get dandruff i wash my hair with Head & Shoulders - it takes 2-3 times and its gone. Frikin awesome product!