WIN 55,212-2 is a potent cannabinoid receptor agonist[4] that has been found to be a potent analgesic[5] in a rat model of neuropathic pain[6]. It activates p42 and p44 MAP kinase via receptor-mediated signaling.[7]
WIN 55,212-2, alongside HU-210 and JWH-133, are implicated in preventing the inflammation caused by Amyloid beta proteins involved in Alzheimer's Disease, in addition to preventing cognitive impairment and loss of neuronal markers. This anti-inflammatory action is induced through the agonization of cannabinoid receptors, which prevents microglial activation that elicits the inflammation. Additionally, cannabinoids completely abolish neurotoxicity related to microglia activation in rat models.(from Wiki)
Best one i've ever tried, is water soluble as well so it can be applied nasally for near instant results. 5-20 mgs would certainly end a tension headache or muscle tension I was having, not to mention WIN-55-212-2 was one of my favorite noid highs of all time. It is absurdly pleasant. I made it a point to have some around as I have muscle problems/back problems and 55212-2 could do as effective a job as actual muscle relaxers and I hate having to take certain chemicals often so(might not be near as effective for you, as I have always found any noid to be an effective PK or AI though they obviously vary) .......