A 4 oz bottle of hcg drops lasts 80 days. A 4 Oz bottle is a 3 month supply with break days especially for women. Its usually sufficient for a detailed diet program from a genuine hcg drops company. HCG complex has 2ox bottle while Triumph hcg drops come in 1 ox bottle. Rarely do you see a 4 oz bottle. Usually, people buy multiple 2 oz bottles or 1 oz bottles for their diet. HCG has a longer shelf life and its ok to store them as long as they are unopened. Storing a 4 oz bottle for 3 months is usually not recommended.