Each box of Percy's Powder contains 60 sachets (Two months supply). The mineral sulphates present in Percy's formulation include: magnesium, potassium, iron, zinc and manganese - in the exact ratios perfected by Percy Weston. The dosage is: one sachet per day - the ideal maintenance dose for most people, and is best taken in conjunction with a vitamin supplement containing vitamin B12. A 1.4g sachet of powder stirred into a glass of water with the juice of half a lemon makes a refreshing, effervescent alkaline drink