Are the raspberry ke- tones as good as they say they are and is there any comcerns by taking it?

Sounds like a fad: Raspberry ketones sounds like another dieting fad product (unlikely to do much). Helpful weight loss diets have natural foods that take time to chew but contain few calories. Examples include carrots, celery, and iceberg lettuce (little/no salad dressing). Drinks without calories include water and green tea. A calorie is a calorie, but surely avoid sugar & simple starch calories.