How to Read a Supplement Label and Subscription: Serving Size, Price per Day and Renewals (What to Check)

Supplement shopping online usually starts with a big promise on the front of the bag and a bright "save 30%" button. The details that decide what you actually get, and what you actually pay, sit in two less exciting places: the supplement facts panel and the subscription terms. This guide explains how to read both so you can compare products on equal terms, whatever kind of supplement you are looking at. It is not medical advice; whether a supplement is right for you is a question for your doctor or pharmacist.

Start with serving size and daily dose

The first line of a supplement facts panel gives the serving size and the number of servings per container. These two numbers are easy to misread:

• A serving is not always a day. A label may define one capsule as a serving and then tell you to take two or three a day. A bottle with "60 servings" may last only 30 days.
• Check the suggested use. It usually sits above or below the panel. Multiply the serving size by the number of servings you are told to take each day to get your real daily dose.
• Count days, not units. Divide the total count by the daily number of capsules, gummies or scoops to find how long one container actually lasts.

For example, a 60-capsule bag with a serving size of one capsule and a suggested use of two a day is a 30-day supply, not a 60-day one.

Know what a proprietary blend tells you, and what it does not

Many supplements group several ingredients under a "proprietary blend" with a single total weight. The label must list the ingredients in the blend, generally in descending order by weight, but it does not have to show how much of each one is inside. That means:

• You can see what is in the product, but not the dose of any single ingredient.
• Two products with similar blend names can contain very different amounts of the same ingredient.
• A large total weight does not tell you which ingredient makes up most of it.

If you care about a specific ingredient, look for a label that lists its amount separately, or ask the brand. Also read the "other ingredients" line, which lists capsule materials, flow agents, sweeteners and flavorings. Compare it with marketing phrases such as "no fillers" or "nothing added," and with any allergy or diet needs you have, such as gelatin capsules for vegetarians or shellfish-derived ingredients.

Work out the price per day

Sticker prices are hard to compare when bottles last different lengths of time. Convert everything to a cost per day:

• Take the price you will actually pay, including shipping if it is charged.
• Divide by the number of days the container lasts at the suggested use.
• Do the same for the subscription price, the multi-pack price and the renewal price, not just the first order.

A $30 bottle that lasts 15 days costs more per day than a $45 bottle that lasts 30. Price per day is also the fairest way to compare a gummy, a capsule and a powder of the same ingredient.

Read the subscription terms before you click

Subscribe-and-save offers can be good value, but they are also where many buyers get caught out. Before you sign up, find answers to these questions, usually in the product page small print, the cart, the FAQ or a "cancellation policy" page:

• Is a one-time purchase available? Some products can only be bought on subscription.
• Is the first price the renewal price? Introductory offers sometimes charge less for the first shipment and more for every one after it. Look for wording such as "renews at."
• How often will you be charged? Monthly, every 60 days or every 90 days, and whether multi-month plans are billed upfront.
• How do you cancel? An online portal, a link in your confirmation email, or only by contacting support. Note any deadline before the next order is processed.
• Do free gifts come with conditions? Bonus items on the first order can make the deal look bigger than the ongoing price.

Put the renewal date in your calendar the day you order. It is the simplest way to avoid paying for a shipment you did not want. For a worked example of a subscription with a lower first payment and a higher renewal price, see our Primal Queen review.

Check money-back guarantees for the fine print

Long guarantees are common in supplements, and the conditions vary more than the headline number. Look for:

• Whether the window counts from the order date or the delivery date.
• Whether it covers every order or only the first or most recent one.
• Whether you must ship the product back, and who pays for postage.
• Whether discounted or sale items are excluded.
• How long the refund takes once approved.

Look for lab reports and know their limits

Many brands now post a certificate of analysis (COA) from a third-party lab. A useful report names the lab, the product, the lot or batch number and the test date. Contaminant testing usually covers heavy metals such as lead, arsenic, cadmium and mercury, plus microbes such as E. coli and Salmonella. Check whether the report shows limits or a pass or fail result, or only raw numbers, and whether it matches the batch you would receive. A lab report confirms what was measured in one sample; it is not evidence that a product does what the marketing says. Claims on supplement labels have not been evaluated by the FDA, and US supplement labels that make structure or function claims carry a disclaimer saying so.

A quick checklist

• Find the serving size, servings per container and suggested daily use
• Work out how many days one container lasts
• Note whether key ingredients are listed with amounts or hidden in a proprietary blend
• Read the "other ingredients" line for capsules, sweeteners and allergens
• Calculate the price per day for one-time, subscription and renewal prices
• Confirm whether a one-time purchase exists and how to cancel a subscription
• Read the guarantee conditions: which orders, return postage, exclusions
• Look for a recent lab report tied to a specific batch
• Talk to your doctor or pharmacist first if you are pregnant, nursing, take medication or have a health condition