However, many people are wondering about pure raspberry ketone and side effects, it may be questioned whether the product is not dangerous because it is very useful. If you're looking for an all natural safe to lose weight fast then pure raspberry ketones are the way to go. Pure raspberry ketone is the name of the enzyme that is extracted from the fruit is delicious. This product is one of the most popular product for acai berry, and more and more people take to improve their health goals. - Apple cider vinegar is often used to help speed up your metabolism and increase healthy weight.