Percy's Powder Sachets (1.4g)For more than 50 years Percy Weston has been manufacturing Percys Powders a remedy so complete he cured himself with diet and the mineral powder. Percys Powder is a dietary supplement containing essential minerals. A 1. 4g sachet of this powder stirred into a glass of water with the juice of half a lemon makes a refreshing, effervescent drink. Percys Powder is a blood tonic and may help maintain normal blood. It is a valuable source of iron and zinc.