Botulinum Toxin Safety & Efficacy Review

Despite its history, should Botulinum Toxin be considered safe and equally effective across both modern medical and cosmetic usage? Is the title - I have spent so long on the project but my assessor has told me I am not synthesising sources... (Budget: £250 - £750 GBP, Jobs: Academic Writing, Data Analysis, Healthcare Education, Medical, Medical Research, Medical Writing, Research, Research Writing)