Hi
if you notice that your breasts have become smaller with workout then that means instead of fat loss there might be muscle loss as well..(or) it can be the other way around like along with fat loss there should be muscle loss as well...
From well balanced diet like consuming complex carbs, good amount of dietary protein either both plant or animal protein and proper workout you can regain your breast size back in some time..
Have good quality plant proteins, milk and milk products, lentils, legumes , sprouts, cereal pulse combination fermented foods, all variety nuts, seeds, dry fruits , all seasonal fruits and vegetables etc...in your daily diet.
Plant based natural phytoestrogens through diet may help to some extent..
Next Steps
please take advise from doctor on taking any supplements..
It's not recommended to take any kind of multi
vitamin supplements on our own..