No.
The various substances that come in vitamins are things that your body does not naturally produce. You require an external source – typically the food you eat – to provide them for you. Taking a vitamin makes you no more reliant on an external source than eating meals.
That said, most people already get enough of these substances from their diet. So long as you eat a _reasonably_ balanced diet, they are not necessary and can actually be harmful in select cases.
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