is it good before work out or it will cause problems with digestion?
I put it in a smoothie post workout. But a spoon full before should give you energy.
I generally just avoid food for 90 minutes to 2 hours beforehand and never have issues.
Peanut Butter (SODIUM likely) is good preworkout, espically when combined with fast acting carbs as it'll slow down the insulin response & release of carb spike.
An example is 2-4x Rice Cakes + 20-30g Peanut Butter (High Sodium) + Jam/Honey or another fast acting sugar. IF you have money, a supplement such as Vitargo or whatever the US version is called is your best bet.
Water + Salt is one of the most overlooked element of preworkout: If your not carbs + hydration + salt is KEY to maximise pumps, forgetting any preworkout "MAGIC" protocol first.