But, since both of these formulas you are considering are from the same GNC product line, we are going to give them the benefit of the doubt and say YES, you can take them together. They might be stackable by design. For the same reasons, follow the manufacturer’s directions exactly. GNC should be giving directions that work for consumers just like you, who want to take more than one GNC product at once. You might also consider taking a different T-Booster, unless you are a mature man over age 50. There are better formulas out there, in my opinion.