Turmeric is poorly absorbed by the body. This is why the combination with black pepper is interesting, as they work hand-in-hand, because the spicy component of black pepper - the piperine - improves absorption.
Wat is het wetenschappelijk bewijs van Black pepper
Piperine is the spicy component of black pepper. It provides 20 times better absorption of turmeric into your body. Not insignificantly, black pepper contains only 5 to 9% piperine. So this means that more than 90% of the black pepper you use in cooking is not piperine, moreover, piperine is sensitive to heat. So supplementing it is an absolute must.