The natural production and absorption of many vitamins is regulated by negative feedback loops.

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Negative feedback loops are a common regulatory mechanism in many biological processes, including the production and absorption of vitamins. These loops help maintain homeostasis by reducing the output or activity of a pathway when levels of a product or substrate become too high or low, respectively. For example, when levels of a particular vitamin in the body increase, negative feedback may decrease its production by enzymes or uptake by receptors, helping to prevent toxicity. Similarly, when levels of a vitamin decrease, negative feedback may stimulate its production or uptake to restore balance.

The Natural Production and Absorption of Many Vitamins Is Regulated