During the procedure, skin and tissue are pulled and held firmly while a long needle is inserted into the muscle. After the medication is injected, the skin and tissue are released. When you insert a needle into the tissues, it leaves a very small hole, or track. Small amounts of medication can sometimes leak backwards through this track and be absorbed into other tissues. Pulling the skin and tissue before the injection causes the needle track to take the shape of the letter “Z,” which gives the procedure its name. This zigzag track line is what prevents medication from leaking from the muscle into surrounding tissue.
No. There is no clinical evidence a "faster metabolism" makes any medication, anti-wrinkle injections included, wear off faster. The amount of time the effect lasts is dependent on the muscle size and the number of units of anti-wrinkle injections used. If you are a young fit healthy person and the anti-wrinkle injections are wearing off quickly the dose was probably too low. Anecdotally, Kiora treats many elite level sportspeople who train (hard!) 3 times a day. Their anti-wrinkle injections will last the same period of time as a deskbound doctor or lawyer.