Please be warned that some of the products contain dangerous and possibly dangerous chemicals.
If you want to know which ones actually do help, you may read on. It has been brought to my attention that there are lots of "Bras-in-a-bottle" products that have nothing to do with breasts. These products are often advertised as "batteries in a bottle". So what are they? The first thing to know is that they don't contain Batteries. They are actually made from different chemicals. Most of these products are made from Sodium Hydroxide (NaOH). This is a very common chemical that is used in water treatment. It is not very safe, because it can cause very bad burns, poison, or even cancer. But there is something called Sodium Bicarbonate, which is safe and has been used in many products since the 1950s. But Bicarbonate is a much safer chemical that should only be used as a last resort. Sodium Bicarbonate is used for all kinds of medical purposes. It's used in breast pumps and in some cosmetics. It's used in the treatment of diabetes, to remove body odor and to treat skin problems like acne, wrinkles, and even rosacea. But it's usually used in cosmetic and skin products for the bigger breasts. It is the same chemical as vinegar, which you can use as a bleach.