Yeah Xtend basically tells you to constantly consume their product, even multiple servings, and BSN says cycle off. Both recovery products.
Here's what AminoX says
To maximize the effects of AMINOx™ consume 120 oz. of water per day and a diet that is rich in protein and carbohydrates. Your body chemistry and weight will determine how long it takes to experience the effect of AMINOx™. AMINOx™ begins to induce its maximum effects in weeks 3-12.
After 12 weeks of use, discontinue for at least 4 weeks.