There are different types of Kratom:
Bali is widely sold and one of the most sedating/opiate-like types of Kratom. It is said to be not as potent as Thai Kratom, and with rather euphoric properties. Thai is said to be more potent and to have more stimulating properties. There are other kinds, from other countries in Southeast Asia, like Malaysia and Indonesia.
There are mainly two types of Kratom: white vein Kratom and red vein Kratom. Most users prefer a mix of both, even though the red vein Kratom is said to be more potent. The alkaloid mixture is just different from the white vain Kratom.
The following forms of Kratom can be distinguished:
[top]Fresh Kratom leaves

Kratom inside South-East Asia is often sold in the form of fresh leaves or tea. Fresh leaves are commonly chewed to achieve the desired effects. Before leaves are sold or consumed, it is normal for the stringy central veins to be removed. This is done to help prevent the nausea that can occur by using Kratom.
[top]Dried Kratom leaves

Kratom outside South-East Asia is mostly sold as dried foliage and extracts. Foliage is often times shredded or powdered for making tea. This Kratom generally is not fresh, and is significantly more expensive, depending on its potency. Foliage is often times labeled by its potency, with such terms as standard strength, premium and super strength. Some vendors have also tested the alkaloid content of their Kratom and categorized it. Most material falls in the range of 65 milligrams per 25 grams of material to 300 milligrams per 25 grams of material. Foliage tends to loose potency with time. Shredded and powdered material appears to loose potency faster than whole leaves. Freezing the plant matter can help prevent the loss of potency. It's interesting to note that although there are many internet vendors, almost all of the Kratom sold outside South-East Asia appears to have come from only a few different sources.
[top]Kratom Extract

Some Kratom users also make crude extracts by boiling large amounts of leaves in water, and evaporating the liquid until a thick resin remains. The extract can be stored for long periods of time. Extracts are often times eaten, or made into tea. Most commercial extract appears in the form of thick, dark tar. Extracts tend to be made using acetic acid and water in the extraction process. These crude extracts are no where near pure alkaloids however. There is still a great deal of organic matter mixed in with the alkaloids. A few internet vendors have been reported to sell pure alkaloid extracts, but they are sold at a price range too high for most people.
[top]Fake Kratom
Fake Kratom has also been widely sold in the past. This fake Kratom has been sold by some vendors with the name "mellow gold". There have been many claims of fake Kratom being sold in the past, but it appears that most Kratom on the market now is authentic. It is not known what plant matter was actually being sold as Kratom, but it is suspected that it is from a tree in the same family of genus.
[top]Kratom Pies
Some vendors recently started selling Kratom pies, which seem to be the new version of the extracts, since the original didn't work out well and many customers were unsatisfied with them.
Although they are rather expensive, many have had good experiences with the pies. They are easy to handle. The vendors sell the Kratom extract in pies and say that you could form small pills out of them and just swallow them. That is not true; it won't dissolve in your stomach!
They are rather expensive and most people say that they seem to be similar to many "normal" extracts- disappointing. In general, ieshey are not worth the bang for the buck, and the amount of alkaloids that they are said to have varies strongly from the actual amount.
[top]Other Mitragyna varieties
There have been reports on alternative Mitragyna species other than Kratom. At the time of the writing of this article, no experience report has yet reached drugs-forum.com.
[top]Potentiators
There are ways to save money and potentiate the effects of Kratom. They are similar to the ways described for
Opioids here. Most might apply to Kratom as well, since it works on the same Receptors as most Opioids do.
The first thing is to start with an empty stomach. Many have made good experiences with drinking grapefruit juice while taking Kratom (which works as a weak MAO Inhibitor) and maybe adding some (really, not much, as it would destroy the effects of the Kratom, like 30mg)
DXM.
[top]Kratom Alkaloids

There are about 25 alkaloids that have been identified in this species of tree, including and . is believed to be the responsible for most of the plants narcotic effect, but it is still unknown as to how the other alkaloids affect humans. is of particular interest because it has been shown to have agonistic properties, as well as profound analgesic effects. Studies involving rats have suggested that 7-hydrohydroxymitragynine is significantly more effective with regards to analgesic effects than morphine. 7-hydrohydroxymitragynine also appears to be absorbed orally better than morphine. It is likely that 7-hydrohydroxymitragynine plays a significant role in the effects of the Kratom plant when consumed. Kratom also contains the alkaloids paynanthine, speciogynine and several less abundant alkaloids.
Even though Kratom works like opioids and connects to the mu receptors in the brain, it has actually similarties with
tryptamines.
Ajmalicine (Raubasine) Cerebrocirculant, antiaggregant, anti-adrenergic (at alpha-1), sedative, anticonvulsant, smooth muscle relaxer
Corynantheidine Opioid antagonist
Corynoxeine Calcium channel blocker
Corynoxine A and B Dopamine mediating anti-locomotives
(-)-Epicatechin Antioxidant, antiaggregant, antibacterial, antidiabetic, antihepatitic, anti-inflammatory, anti-leukemic, antimutagenic, antiperoxidant, antiviral, cancer preventative, alpha-amylase inhibitor
9-Hydroxycorynantheidine Partial opioid agonist
7-Hydroxymitragynine Analgesic, antitussive, antidiarrheal; primary psychoactive in kratom
Isomitraphylline Immunostimulant, anti-leukemic
Isopteropodine Immunostimulant
Mitragynine Analgesic, antitussive, antidiarrheal, adrenergic, antimalarial, possible
psychedelic (5-HT2A) antagonist
Mitraphylline Vasodilator, antihypertensive, muscle relaxer, diuretic, anti-amnesic, possible immunostimulant
Paynantheine Smooth muscle relaxer
Rhynchophylline Vasodilator, antihypertensive, calcium channel blocker, antiaggregant, anti-inflammatory, antipyretic, anti-arrhythmic, antithelmintic
Speciociliatine Weak opioid agonist
Speciogynine Smooth muscle relaxer
Speciophylline Anti-leukemic
Tetrahydroalstonine Hypoglycemic, anti-adrenergic (at alpha-2)