Which vitamin is known to potentially be toxic if consumed in excess?

Vitamin A is known to potentially be toxic if consumed in excess due to its fat-soluble nature. Unlike water-soluble vitamins, which the body can excrete relatively easily, fat-soluble vitamins, such as Vitamin A, can accumulate in body tissues. High doses over time can lead to hypervitaminosis A, a condition characterized by symptoms that can range from nausea and headaches to more severe health issues such as liver damage and intracranial pressure. This potential for toxicity underscores the necessity of adhering to recommended dietary allowances and being cautious with supplements that contain high levels of Vitamin A. In contrast, vitamins like C, B12, and K are generally considered safer, as any excess is typically excreted by the body without the same risk of toxicity.