Understanding Supplement Labels: What Those Numbers Actually Mean

The Two Numbers on Every Nutrient

Every nutrient on a supplement label carries two figures: the amount per daily serving, and the percentage of the Nutrient Reference Value (NRV). Both matter, and they answer different questions.

• Amount per serving — how much of the nutrient is in one serving, in milligrams (mg) or micrograms (µg).
• %NRV — how that amount compares to the daily reference value defined in Regulation (EU) No 1169/2011. 100% means the serving provides the full reference amount.

mg vs µg — the Difference That Is Easy to Miss

The unit is the most important part of the number. A milligram and a microgram differ by a factor of 1000: 50 µg is 0.05 mg. Labels mix both units because nutrients differ enormously in the amounts the body needs — zinc is labelled in milligrams (10 mg = 100% NRV in the Nutri-Leaf Immunity Complex), while selenium and biotin are labelled in micrograms (50 µg selenium = 91% NRV; 50 µg biotin = 100% NRV). A "50" that means micrograms and a "50" that means milligrams are not the same thing.

Why %NRV Is the Fairer Comparison

Raw amounts are hard to compare across nutrients: 10 mg of zinc is 100% NRV, while 10 mg of vitamin C would be a small fraction of its reference value. The %NRV puts both on the same scale — how much of the daily reference amount does this serving provide? That is the number to read when comparing products, not the milligram count alone.

What the Numbers Do Not Tell You

Be clear about the limits:

• NRV is a reference value, not a personal target. Individual needs vary with age, diet, and circumstances.
• Above 100% is not automatically better. For some nutrients values above 100% NRV are common and fine; for others, high intakes come with upper limits. The label's recommended daily intake is there to be followed.
• The number says nothing about quality. Two products can both declare "10 mg zinc" while using different zinc forms with different properties — which is why the chemical form in brackets matters too.

A 30-Second Label Check

• Read the unit: mg or µg?
• Read the %NRV: does the serving cover a meaningful part of the daily reference value?
• Check the form in brackets: what exactly is inside?
• Add up overlapping nutrients across products you combine, and never exceed the recommended daily intake.

For the full walkthrough — including the ingredient list and the capsule shell — see how to read a supplement label. The Immunity Complex Capsules product page shows all of this on a real label.

Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.