Also known as black pepper extract, biopepine, and a couple other names. 10mg = about 1/4 teaspoon of black pepper.
It increases the secretion of digestive enzymes so supps/nutrients/vitamins/etc breakdown faster, thereby increasing bioavailability.
Works great with turmeric (~2000% increase in bioavailability, if I remember correctly).
Also works with, kratom, adderall, nootropics, nutrient-rich foods in general, coffee, green and black tea, apple cider vinegar... just about everything.
People that have problems absorbing nutrients take it to increase the effectiveness of therapeutic drugs. It's also why black pepper with spinach, asparagus, broccoli, and brussel sprouts is so damn good.
I've found it most effective if taken with a small amount of high carb/high fat warm foods like rice and butter; they will cause your body to send more blood to your stomach, further enhancing the effects. Ginger ale (real ginger ale—like Seagrams, not the cheap generic crap) also enhances its effects.
It's been amazing in my experience.