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 thin shoulder needle itself has no side effects, just like some drugs are good in themselves, but if they are given to the wrong patient or eaten too much, they will have adverse reactions.