Dangerous for me because I've never capped anything before and getting the dosage wrong could be bad if I mess up. But I'm considering buying from thefertilizerclub and buying a capping kit. I haven't seen any reviews so hopefully I won't waste my money
I have not capped DNP but I have looked into it extensively nd what I'm saying below is really just common sense.
If you have known good raw material, as in you bought it and then had it tested by a reputable lab, then the dosage is only an issue if you're mixing it with something else. If you mix it then you have to make sure the mix is perfectly blended, which is very hard without proper equipment. Simple solution: Don't mix it.
If you don't mix it all you need is a capping kit, the caps, the raws and a scale. Measure out the powder, let it dry, distribute it evenly across the caps, then to be extra sure weigh each one.
To be even safer, use caps that only hold so much. Many guys use size 00 caps, which will hold a lot more than 300mg powder DNP. So, use a smaller one. I forget which but there is a smaller size which holds about 200mg. So, you have a little safety built in and the cap is smaller, so easier to swallow.
Be sure to know if you're using powder or crystal.
And like I said, it's notoriously messy!