There are a few things to look out for when shopping for extracts. A super low price generally indicates a cheap or unwanted extract. The “crystal” shiny looking extracts are a basic crude extraction generally performed in Indonesia with low grade “toss out” powder that could not be easily sold. Often times lab tests are not available and they will be marketed as a “50x” or something similar with an “x”. They’re named with “crystal”, “glass” and other things to emphasize the shiny appearance. These extracts generally don’t surpass around 5-8% MIT content.
There are free base and salt extractions. Neither is superior but they are different from each other. It is wise to find out which type your extract is. Most extracts will be free base, so if the description doesn’t specify the extract is most likely a free base. When the MIT percentage starts climbing over 45%, it may be a salt. If the extract you are looking at is advertised as “water soluble” it is likely a salt but the claim about being water soluble is untrue. A salt requires an acid like citric acid in the water in order to be soluble.
Extracts can come in different colors based on the extraction methods but super bright colors are usually not a good sign. This generally only happens with “crystal” extracts to make them more appealing. Deeper orange and red colors on mit percentages 40% or less can indicate leftover solvents.
Strong odors emitted from the extract indicate residual solvents. This means part of the extraction process was not done properly and not all of those chemicals are evaporated from the final product. If a food safe solvent like citric acid is used then this isn’t a big deal, but if a harsher solvent like methanol is used (without proper protocol) this can be a really big deal and cause irreversible damage to the consumer. Due to the unregulated nature, there are no laws or standards on what chemicals can and can’t be used for extraction.
Just like different veins of kratom, extracts can have varying balances of alkaloids. In fact, they can have more prominent differences. It is a good idea to pay attention to not only the MIT and 7-OH content but the secondary alkaloids as well, to learn what types may be more or less suitable for your specific needs.