5328. Ayer's Sarsaparilla. Take 3 fluid ounces each of alcohol, fluid extracts of sarsaparilla and of stillingia; 2 fluid ounces each fluid extracts of yellow-dock and of podophyllin; 1 ounce sugar, 90 grains Iodide of potassium, and 10 grains Iodide of iron. This is from a receipt given by Dr. Ayer himself.
90 grains is almost 6 grams. 6 grams of KI in an 8oz herbal tincture? damn right it will give you vitality.