To date none of the breast cream products that are proven effective to tighten the breast. So these products do not actually have any effect. Medically, how to enlarge breasts is to use the method of operation.Method of operation is mostly done using silicone implants made or by using the patient’s own fat from the body. Operation “breast augmentation” is usually done by a plastic surgeon.
For security level, it depends on the type of products that are used specifically. Usually such products using ingredients from herbal extracts, therefore making the product manufacturer states that the product is safe.
Nevertheless, I recommend that you see if the products have been listed in the POM or not. Products that have been registered or certified in the POM can be more trusted than the level of security that has not been registered. Beware also likely to be the onset of allergic or hypersensitivity reactions from the use of such products.