Does Sculptra in the buttock have any side effects to heart or lungs, bloodstream?

Great question.  Sculptra is a great treatment that is non-invasive and can improve projection, contour and texture of the buttock.  See the link below for some important research on the topic.

Thank you for your question!  Sculptra has been safely used to for butt augmentation.  Keep in mind it is very important to schedule a consultation with an experienced doctor.  Best regards!

Sculptra is liquified, crystallized Vicryl suture, which has been used inside the body for generations! It is quite safe, and is not going to move to your heart or lungs.
Sculptra triggers collagen formation.
In my experience, the best product to build more NATURAL (looking and feeling) buttocks tissue is your very own PRP (platelet rich plasma) from your own blood...as in the Vampire and PRP procedures.  In these procedures, after a blood draw, your blood is processed to isolate the portion of your blood that contains over 20 growth factors (found in the platelet rich plasma), inject it into the tissue needing more growth, and it stimulates stem cells to gather in the area and grow more tissue as determined by the DNA of the cells of that area.  Both breasts and buttocks respond so exceedingly well that even the platelet poor plasma can be injected and get better results!  You will get no long-term lumps, bumps, or other abnormalities....only a greater volume of natural buttocks fatty tissue! 
With both procedures, you want to make sure the surgeon injects you in a way that will leave to augmentation where YOU want it.