I would honestly say wait. your 20, you want to be respected for who you are and your personality.I was born blessed with a big chest and I had a hard time finding a man that didnt like me just for my boobs!. I also was called a slut and other names because people assumed i was because of my big breasts. take the time to discover who you are, you still have many years and its not worth the backaches and the spine damage ( big breasts are not as great as they seem). not to mention with suppliments you never know how you will react to any medicine. I am sorry if i didnt help. but here are a few natural tips to try You can try having Til or Sesame Seeds which is very effective in firming and enlarging the breasts of women . This seed is made up of calcium, protein, iron and phosphorous and should be included in one's daily diet. The oil also can be applied on the breast. use herbs such as Fenugreek, saw palmetto, wild mexican yam , Pueraria mirifica, Ashwagandha, Jatamansi, Saraca Indica, Saw Palmetto, Damiana, Dong Quai, Blessed Thistle, feral Yam, and Fennel Seed.The most popular breast enhancement exercise is a push-up. resource found at www.practicenaturalcures.com.