Vitamin C and the B vitamins do not build up in the human body and need to be consumed regularly.
Notes on verification
Confirmed by multiple reputable medical/nutrition sources (NIH MedlinePlus, Cleveland Clinic, Colorado State University Extension, Medical News Today). Minor caveat: vitamin B12 can be stored in the liver for years, unlike other B vitamins and vitamin C.
Sources
- A Healthy Lifestyle Can Add Years to Life, Despite 'Bad' Genes (webmd.com)
- https://extension.colostate.edu/resource/water-soluble-vitamins-b-complex-and-vitamin-c/ (extension.colostate.edu)
- https://www.medicalnewstoday.com/articles/water-soluble-vitamins (medicalnewstoday.com)
- https://health.clevelandclinic.org/water-soluble-vitamins (health.clevelandclinic.org)
- https://medlineplus.gov/ency/article/002399.htm (medlineplus.gov)