Final answer:
Large doses of vitamin C may aid in iron absorption and reduce common cold symptoms, but can also lead to health complications if intake exceeds the recommended levels. It is essential to consult a health professional for advice on vitamin supplementation.
Step-by-step explanation:
When taken in large doses, greater than 1 gram per day, vitamin C can have various effects on the body. While it helps in the absorption of iron from the intestine and may reduce the duration and severity of the common cold, excessive intake can lead to health complications.
The body uses what it needs from water-soluble vitamins like vitamin C, and the excess is usually excreted through urine. However, there is a concern with hypervitaminosis, or vitamin toxicity, when intake surpasses the tolerable upper intake levels (UL). It is important to adhere to recommended daily doses to prevent the negative effects of overdosing on vitamins, even water-soluble ones.
Taking vitamin C in amounts higher than the UL can have adverse health outcomes, such as potentially increasing the risk of kidney stones or interfering with the effectiveness of certain medications. It's crucial for individuals to seek advice from health professionals regarding the appropriate type and amount of vitamin supplementation.