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. [tier=gold indep_score=0.9 clusters=4 claim_tier=everyday]
Sources
- A Healthy Lifestyle Can Add Years to Life, Despite 'Bad' Genes (seed:health_and_medicine)
- https://extension.colostate.edu/resource/water-soluble-vitamins-b-complex-and-vitamin-c/ (corroboration)
- https://www.medicalnewstoday.com/articles/water-soluble-vitamins (corroboration)
- https://health.clevelandclinic.org/water-soluble-vitamins (corroboration)
- https://medlineplus.gov/ency/article/002399.htm (corroboration)