How to Read a Supplement Label: A Beginner's Guide

Walking down the supplement aisle can be overwhelming. Labels are packed with numbers, percentages, and terms that can confuse even health-conscious consumers. Understanding how to read a supplement label is essential for making informed choices about what you put in your body.

Every supplement sold in the UK must display certain information. The key elements to check are:

• Serving size: This tells you how much constitutes one dose. Some products require multiple capsules per serving — if you only take one, you're getting a fraction of the stated amounts.
• Amount per serving: The actual quantity of each ingredient in one serving, usually in milligrams (mg) or micrograms (mcg/ug).
• NRV (Nutrient Reference Value): The percentage of your recommended daily intake. Previously called RDA (Recommended Daily Allowance). A value of 100% means one serving provides the Nutrient Reference Value.

The ingredients list is ordered by quantity — the first ingredient is the most abundant. Look beyond the active ingredients to the 'other ingredients' section. The 'other ingredients' list shows the capsule shell and any flow agents.

The form of a nutrient dramatically affects how well your body absorbs and uses it. Key examples:

• The label names the form of each nutrient, for example folic acid or methylfolate, magnesium oxide or citrate.

Trustworthy supplements often carry third-party certifications: GMP (Good Manufacturing Practice), ISO certification, or independent lab testing verification. Vegan, organic, and allergen-free certifications are also relevant depending on your needs.

Be cautious of supplements that make specific disease claims (illegal in the UK), contain proprietary blends that hide individual ingredient amounts, list doses far exceeding the NRV without justification, or use excessive artificial colours and flavours.

Knowing what to avoid is just as important as knowing what to look for:

• "Proprietary blend": the label lists the ingredients of the blend; some blends also give each amount.
• Mega-doses of single nutrients: A vitamin B12 supplement providing 50,000% of your NRV is not 500 times more effective. Water-soluble vitamins are simply excreted once your body has enough. Fat-soluble vitamins (A, D, E, K) can be dangerous in excess.
• "Natural" without certification: The word "natural" is not regulated in the UK supplement industry. Without organic or specific certifications to back the claim, it is meaningless marketing.
• Colours: the label lists any colour used. Your supplement does not need to be bright orange.

Always read the full ingredients list, not just the front label. Check the "other ingredients" section for fillers and additives. Compare the NRV percentages to understand the relative strength of each ingredient. Look for GMP certification and, ideally, third-party testing by an independent lab. Store as directed on the label. Check expiry dates, especially for probiotics where viability decreases over time. If a product makes health claims that sound too good to be true, they probably are — legitimate supplements support health rather than cure diseases.

Recommended for You

Vitamins Multi

£15.49

Shop Now

This article is for informational purposes only and does not constitute medical advice. Vitadefence supplements are food supplements, not medicines. Consult a healthcare professional if you are pregnant, breastfeeding, on medication, or have a medical condition.