You should never inject liquid silicone (particularly of industrial grade) into your body to alter your silhouette, as it carries the risk of serious physical complications, infections, and life-threatening dangers due to migration into the organs.

noli's read

The warning against the injection of free liquid silicone is fully validated by research and health authorities. According to a warning from the U.S. FDA (expert opinion/regulation), the direct injection of silicone for body contouring presents major risks of deformity and rejection reactions. Observational studies, notably a review published in the Journal of Plastic, Reconstructive & Aesthetic Surgery, confirm that liquid silicone can migrate through tissues, creating painful lumps and chronic inflammation. Furthermore, case reports (observational studies) document that silicone can infiltrate the bloodstream and reach the lungs, causing potentially fatal acute respiratory distress. The use of industrial silicone (non-sterile and unpurified) drastically amplifies these dangers by introducing impurities that are toxic to our cells. This alert is therefore scientifically unimpeachable and essential for the preservation of bodily integrity.

the sources

No named source held this one up — that absence is part of the verdict.