Vitamins are essential nutrients, and understanding their types and the common nutrition terms on labels can help you make healthier choices.
Water-Soluble vs. Fat-Soluble Vitamins
- Water-Soluble Vitamins: These include Vitamin C and B Vitamins (like B12, B6, and folate). They dissolve in water and aren’t stored in the body, so we need them regularly. For example, Vitamin C supports immunity but is easily lost in urine, so regular intake is key.
- Fat-Soluble Vitamins: These vitamins—A, D, E, and K—are stored in body fat and the liver. They can build up, so it’s possible to get too much. For instance, Vitamin D supports bones and immunity but can be toxic at high levels over time.
Key Nutrition Terms
- %NRV (Percent Nutrient Reference Value): Shows how much of a nutrient one serving provides toward the daily requirement. For example, if a product contains 200 micrograms of folate and lists 100% NRV, it meets the daily recommended amount for most adults.
- RDA (Recommended Dietary Allowance): The average daily level of intake sufficient for nearly all healthy people. For example, if the RDA for Vitamin C is about 90 mg for men, meaning this amount meets the needs of 97-98% of men.
- AI (Adequate Intake): Used when RDA isn’t available; it’s an estimate based on healthy people’s intake. For example, the AI for Vitamin K in adult men is 120 micrograms per day.
- UL (Tolerable Upper Intake Level): The maximum daily amount unlikely to cause adverse effects. For example, the UL for Vitamin E is 1,000 mg daily. Above this, there’s a risk of toxicity.
When in doubt, always consult a healthcare provider—especially with high-dose supplements.