[header] How to choose acidophilus [title] Talk to your doctor about taking acidophilus. [step] Your doctor will instruct you on how much of the supplement you need. Acidophilus is measured in cfus (colony-forming units) and typically comes in 2 billion cfus per gram. 
A typical recommendation for dosage is 1 to 2 billion cfus daily. Children's dosages are based on weight and age of the child.