Herbal blends are mixtures which are made of synthetic chemicals and herbs. These are also known as Spice, K2 and many other appellatives. These blends are known to be available in the form of pill and even in powder form.
There are many herbal blends which are available in the market and are marked as research chemicals. These blends have no specification of the synthetic components on them. Whereas many others are available in the market with all the details mentioned and the ingredients used.
If you research chemicals site you will find more information on herbal blends. These are sold in the market and are in good demand today. It is also true that these blends behave a bit similar to illegal products. The main thing about these products is that even though they are similar in physical and chemical properties they fall in different categories.
If you are interested to gain more info in herbal blends then you can search for it online. You will get sites where you can get more information regarding these herbal blends and how they are used.