i have had collagen,but only in my lips. it really dissipated quickly in me, but everyone is different. i would wait for artecoll, if i were you. it is somewhat similar to collagen, and it lasts indefinitely. it has been used in europe for years and will be available in the united states within a year. i had my lips done in canada with artecoll, and i am very pleased. it just makes so much more sense to me to get something that is going to last.....