How long does it take for symptoms of a vitamin deficiency to show up?

The onset of symptoms from a vitamin deficiency can vary widely depending on the specific vitamin, the severity of the deficiency, and individual factors such as overall health and diet. Some deficiencies, like vitamin C, may show symptoms within a few weeks, while others, such as vitamin B12, can take months or even years to manifest. Generally, the body’s stores of vitamins and individual absorption rates play a significant role in how quickly symptoms appear.