Immediately after treatment, the area of the face that was injected will appear fuller, but this is due to the water content in the Biostimulator injection (the microparticles are suspended in sterile water for injection). This temporary fullness will recede in a few days. The true and lasting effects of Biostimulator treatment take weeks or months to become evident. Progressive, results usually become visible within a few weeks of each treatment session. Biostimulator Injections delivers its results gradually as it stimulates new collagen production. Results may last 2 years or longer.