You most definitely can. Immunity Shield packs 23.5 mg of vitamin C per daily serving. According to the National Institute of Health, the tolerable upper limit intake level for vitamin C is 2,000 mg for adults over the age of 19. Even if you took every Nutrili product containing vitamin C, you still wouldn’t come close to this limit! FYI, the following Nutrili products contain vitamin C: Glow & Grow, Beauty Collagen Shots