I am not sure if you are serious or what but, depending on if the peanuts are salted or unsalted you are likely to be ingesting...
Saturated and unsaturated (poly and mono) fats, Omega 3 and 6, Vitamin E and B6, Folate, Niacin, Thiamin, Riboflavin, Zinc, copper, selenium, phosphorus, potassium, calcium, sodium and iron.
So those are what you are likely to encounter from your 'Peanut Method'.
If you consume 1/2 Cup of peanuts you will have an approximate figure of 113.4 grams of peanuts. Now based upon statistics of average Australian produced peanuts you will ingest approximately 200mg of Magnesium. Theoretically, pre-loading with magnesium is for the purpose of relaxing the muscles in the face and head especially around the jaw. End result is one maybe prevented from 'chewing ones face off'.
Practitioners (non drug users included) also note that magnesium needs to be taken daily to promote its intended effect. I personally will use 500mg per day along and drop another 1000mg just prior to using meth or MDMA as a pre-load measure and then another 500mg along with 5htp during post load. I have been doing this for almost 6 months and I must admit that I am not convinced of its effects.
So, by consuming 1/2 cup of peanuts prior to going out and dropping a pill, you will be falling well short of the recommended doasge. This means you will need to up your intake to 283 grams of peanuts.
If you go to your local supermarket and make a b-line for the vitamin section you will be able to purchase a jar of magnesium tablets each with 500mg of magnesium. Perhaps you could take those, especially if you don't like peanuts. Also, remember some people are allergic to peanuts and will need to weigh up th options between not chewing on thier lips when rolling or going into anaphylactic shock and dying!
Sorry, I have to disagree with this becoming 'BIG'