If you have a legal cannabis prescription, you can make your own medicine by buying the cannabis buds (flowers) from your chosen clinic and then make the medicine yourself. This is the form of cannabis oil that is discussed across the internet. It is what I use to treat cancer (very successfully) and other people use it to treat a multitude of different health conditions. In other words, any decent cannabis material that is THC rich can be turned into an oil that treats all of the conditions (55 so far) listed by the UK's private cannabis clinics. It is very easy to make (no matter what they tell you), although you will need to follow some simple rules.. 

Good to know...

• While pharmaceutically cannabis products do work (to a degree), their formulas are nowhere near as strong or as efficacious as the original formula that Rick Simpson discovered when experimenting with cannabis as medicine in 2004. This herbal medicine is made with THC-rich cannabis strains, so be aware that it is very strong. You can read about my experiences with pharmaceutical cannabis medicines here. 
• In addition, I use different strains at different strengths; the strain doesn't matter (although some people report certain strains work  better for them personally), and the strength doesn't either - as long as the buds are higher in THC than CBD (you need both), than the medicine should work. However, I buy strains that have the highest amount of THC (skunk), because that is what is needed for diseases such as cancer, Parkinson's, and other serious conditions.
• In other words, any decent cannabis material that is THC rich can be turned into an oil that treats all of the conditions (55 so far) listed by the UK's private cannabis clinics. It is our endocannabinoid system that enables cannabis medicines do do this. 
• It is also the formula used in the majority of cannabis research abroad. This is  also what I give my 83-year-old mum to treat Parkinson's, Arthritis, and pain. Note: I mix the oil into a jar of honey to dilute it for her.
• The daily dosage is the equivalent of half a grain of rice a day, or 1-3ml per month. My mum knows how to regulate her own medicine, as does everyone once familiarised with the product. It is easy because you know your own body. 
• For those wanting to avoid the effects of THC: The oil can be put into suppository gels (available on Amazon), and taken either vaginally or via the anus. More information here. 

Ingredients, Utensils & Methods

IMPORTANT: For those wanting to use RSO to fight cancer, see further down the page for the details on dosages. You can do the oil along side other cancer treatments, but this would mean having to double the dosage to combat the damage caused by these treatments (e.g. chemotherapy, radiotherapy).

WARNING: The alcohol used is highly flammable. Make sure the area you are working in is well ventilated and that the alcohol is not handled near an open flame. 

QUANTITIES: I oz of cannabis makes approximately 2-3 ml of RSO. 

PLEASE NOTE: This is the method I use. There are other ways, but this is the one taught by Rick Simpson. I know that some people do other things: e.g. freezing the cannabis, but I've yet to try this.

YOU'LL NEED: At least 1oz of cannabis buds, grain alcohol, a large saucepan (I use a pressure cooker with the lid off), a kilner jar or similar (must take heat), a muslin cloth for straining, and a slow cooker.

STAGE 1: First decarb the weed. This releases the cannabinoids and other substances (e.g. terpenes). To do this, first chop the buds (I do this by hand, but you can use a blender), and then place the chopped cannabis into the kilner jar(s) until they are just about half-filled. Place the jars in an unheated oven and then turn it on to a low heat. Keep your eye on the process, which is completed once the buds are very dry. The amount of time needed is dependent on how much weed you're using, so I prefer not to estimate here. When completed, turn the oven off and leave the jars to cool inside. 

STAGE 2: Crumble the buds as small as possible and then cover them with the alcohol. I don't measure the alcohol, but I do make sure the buds are totally covered by at least a couple of inches. I then mash the buds for several minutes into the alcohol and then strain the liquid into the kilner jar. Place the kilner jar into the large saucepan, add partially boiled water until it is half way up the kilner jar, and then bring the water to the boil. Turn down and simmer slowly until around 1-2 inches of liquid is left in the jar.

STAGE 3: Carefully remove the jar from the saucepan and place into the slow cooker. Half fill with boiling water and cook on slow until all the alcohol is evaporated and you are left with the thick, black extract that looks like marmite. 

DOSAGE: RSO is made from plants that are filled with different levels of cannabinoids and other elements. This means that no medicine is exactly the same. It can't be because this is how nature made it. RSO is the most powerful type of cannabis medicine and needs to be taken with caution. So, as with most things, start slow and add if needed. Most people (including me), take the equivalent to half a grain of rice daily.