Really amazing, and really inexpensive.  Vit C in high doses is one of my favorite life hacks.  You cant consume too much Vit C (all that will happen is that you get bubble guts), but high levels of Vit C are a powerful antioxidant and phenomenal for skin and immune health.  If you have any form of compromised immune system Vit C is a must and I actually recommend it for almost everyone.