Help with English

Dear all,
Can somebody please help me with the English?
Regards,
Fizzi

Globally, nutraceutical advertising in nursing journals often provide low quality of information. This serious problem is even greater in developing countries. Evidence from this review clarify that these serious problems have been continuing for more than 25 years. The results from our review lend support to call for the current policy on journal advertising to be reviewed such as providing a common definition of good advertisements among all parties. There is also an urgent need for a global pro-active and effective regulatory system to ensure that information provided in nursing journal advertising is supporting the quality use of vitamins.