A daily serving of BCAAs (5 g), if taken close to meals, adds up to the protein intake provided by the meal itself and this could result in the product not being completely absorbed by the body.
Our body is not able to assimilate a high protein intake all together, therefore one should distribute protein intake from different sources over the day. This is why BCAAs should be taken between meals, preferably at night, right before bedtime in order to make the best out of the "anabolic phase" of the body.