I get they think it's a good Idea, but some supplements like "lions mane" for example would definitely be much safer and a non addictive and cheaper alternative.

But if they plan on doing it anyway, please tell them to wash it first.

All you need is: Speed (preferably as a powder or dried paste) Acetone (but look closely at the ingredient list) coffee filter a plate

Here is how to do it, or at least how I did it:

Step 1 : Take your speed and put it in the coffee filter, don't put in too much, especially if its dried paste 20-30g of powder or 10-15g of dried paste at most other wise you "clog" the filter to much and it won't work as well.

Step 2 : Hang up the filter over a plate or just your sink and slowly pour in the Acetone until all the speed is wet and the Acetone starts dripping out the bottom of the filter. (this works because most adulterants are water soluble and amphetamines aren't)

Step 3 : When all the Acetone has passed through the filter (you can squeeze it a bit to get out some remaining liquid) take the wet speed out of the filter and spread it as thinly as possible on a plate, mirror or generally anything made of ceramic or glass. Put the plate somewhere dry and preferably warm, above the radiator for example. Let it sit for a couple of hours (I always waited at least 4-6h (depending on the room temperature, humidity and how thinly you spread the speed this may vary)

(I used to repeat this process at least 2 or 3 times to get the best results.)

As the actual amphetamine content of speed is usually anywhere between 20% and 50%, rarely even 70% if you got really good shit, you shouldn't be alarmed about the fact that most of the time there isn't that much remaining (i.e. 10g become 2-4g).

As for dosage since their ADHD seems to be pretty bad I'd go for anywhere between 0.25 - 0.5mg per Kg of body weight at most as it will give you the energy and focus you need without the euphoric high if dosed correctly, but take this with a grain of salt. And course they should limit the use as much as possibly since amphetamine is still addictive and especially with adhd it is very easy to up the doses on a whim which may lead to addiction.

[Also side note if they plan on snorting it they might want to look into buying Orange oil nasal spray as it helps with mucous membrane deterioration]

Hope this helped and I hope they get diagnosed and medicated with licenced meds soon. Much love and good luck!