The thin-shoulder needle mainly injects botulinum toxin, which will cause muscle atrophy and uncoordinated shoulders. Botulinum toxin, the component of thin shoulder needle, can effectively block the nerve impulses of nerves and muscles, paralyze over-developed muscles, and shrink the originally hypertrophy muscles through muscle disability and atrophy, thus achieving the effect of slimming. The injection is accurate and the quality of botulinum toxin is up to standard. The narrow-shoulder needle itself has no side effects, just like some drugs are good in themselves, but if they are given to the wrong beauty seeker or eaten too much, they will have side effects.

Whether the thin shoulder needle has side effects is related to many factors. Because the quality of botulinum toxin is not up to standard, the injection of thin shoulder needle is not up to standard, which will have different side effects. Inferior botulinum toxin can lead to muscle weakness and arm weakness, and excessive injection or high concentration will produce side effects of muscle atrophy. If the injection is not accurate, it will easily lead to asymmetry on both sides of the shoulder and the exposed shoulder will be unnatural.