The Supplement Label Maths Most Buyers Skip
Updated 16 August 2026Review DeskAbout 7 min
Key points
- Every amount on a Supplement Facts panel is per serving, not per capsule.
- A 90-capsule bottle at three capsules daily is a 30-day supply, tripling the real cost per day.
- Always convert competing products to cost per day at the labelled serving before comparing.
- A blend's combined weight tells you nothing about the individual amounts inside it.
Start at the top of the panel
Two lines sit at the top of every Supplement Facts panel, and almost everyone reads past them to get to the interesting ingredients below.
Serving Size. How many capsules, tablets or gummies constitute one serving.
Servings Per Container. How many of those the bottle holds.
These two numbers govern everything beneath them, and misreading them is the single most common way buyers misjudge a product — both what they're taking and what they're paying.
How serving size changes the dose
Every amount listed on the panel is per serving. Not per capsule.
So a product listing 1,500 mg of an ingredient at a three-capsule serving delivers 500 mg per capsule. If you take one capsule because that seemed like enough, you're getting a third of what the label implies.
This works the other way too. Marketing frequently cites research on an ingredient without mentioning that the study used several times the amount in a serving. Being able to read the actual per-serving figure is what lets you check.
Products where one unit equals one serving remove the ambiguity entirely. A two-capsule daily serving — the format Primordial Vigor X uses — at least makes the arithmetic simple, even where the ingredient amounts themselves aren't published.
How it changes the price
This is where real money is lost, and it takes ten seconds to check.
Consider two products, both $60 a bottle:
| Product A | Product B | |
|---|---|---|
| Bottle price | $60 | $60 |
| Capsules per bottle | 60 | 90 |
| Serving size | 1 capsule | 3 capsules |
| Days per bottle | 60 | 30 |
| Real cost per day | $1.00 | $2.00 |
Product B looks better on the shelf — more capsules for the same price. It costs twice as much to actually use.
The rule: always convert to cost per day at the labelled serving. The answer is frequently the opposite of what the shelf price suggests, and this single habit will save you more than any other check on this page.
Comparing two products properly
Once you have cost per day, the comparison becomes meaningful. Three steps:
- Cost per day for each, at labelled serving, including shipping.
- Amount of the ingredient you actually care about, per serving — not per bottle, not per blend.
- Cost per unit of that ingredient, which is the only genuine like-for-like number.
Most people compare step one and stop. Doing all three occasionally reveals that a more expensive product is better value, which is counterintuitive enough that it's worth checking.
Worth also including shipping. A $69 bottle plus $9.95 shipping is a $78.95 bottle, and single-bottle options frequently carry shipping that multi-bottle packages don't — which is how the pricing architecture pushes toward the largest commitment.
Blend weights and what they hide
When ingredients are grouped into a proprietary blend, the panel shows one combined weight for the group.
That number is nearly useless for comparison. An 850 mg blend could be 830 mg of one cheap bulk ingredient and traces of the rest, or a reasonable distribution. You can't distinguish them.
You get one clue: where a blend's contents are listed, they appear in descending order by weight. If the ingredient the marketing emphasises appears last, it's the smallest component in the blend.
Where contents aren't listed at all — which is the case for the product this site reviews — even that clue is unavailable, and you're relying entirely on the seller's other terms.
Form and standardisation
Two final details that change what a number means.
Mineral forms. The chemical form appears in parentheses — zinc as oxide, citrate, glycinate or picolinate. Oxide forms are typically cheaper and less well absorbed. Two products listing identical milligram figures can deliver noticeably different amounts.
Botanical standardisation. An extract standardised to a stated percentage of a named compound tells you about batch consistency. A plain plant name doesn't. You'll also see extract ratios like 10:1 — meaning ten parts raw material produced one part extract — which isn't the same as standardisation and doesn't establish active content.
Applying it here
Run the maths on Primordial Vigor X and you get a clean picture on price and a blank on formula.
Price: $69 plus $9.95 shipping for 30 days is roughly $2.63 per day. The three-bottle package at $177 with free shipping is $1.97 per day. The six-bottle at $294 is $1.63. That's a meaningful spread, and the pricing architecture clearly rewards the largest commitment.
Formula: nothing to calculate, because nothing is published. That's the trade-off our full verdict weighs, and our buyer's guide puts in context alongside the other seven checks worth running.
Our verdict on Primordial Vigor X
Good refund terms, opaque formula, overstated marketing elsewhere. We weigh all three on the main assessment page.
Individual results may vary. This is a dietary supplement, not a medication.
Check Current Price →Common questions
What does serving size mean on a supplement label?
It states how many capsules, tablets or gummies constitute one serving. Every ingredient amount listed below it applies per serving, not per individual unit.
How do I calculate the real cost per day?
Divide the bottle price, including shipping, by the number of days the bottle actually lasts at the labelled serving — not by the number of capsules.
Why is a 90-capsule bottle sometimes a 30-day supply?
Because the serving size is three capsules. Servings per container, not capsule count, determines how long a bottle lasts.
What does a proprietary blend weight tell me?
Very little. It gives a combined weight for the group without disclosing individual amounts, so you cannot assess whether any single ingredient is present meaningfully.
Primordial Vigor X Review Desk Written and maintained by our editorial team. We do not employ or cite medical professionals, and this is general information rather than medical advice. We may earn a commission from qualifying purchases, which does not influence what we publish — see our editorial policy.
Medical note
This article is general information, not medical advice, and does not substitute guidance from a certified health professional. If you have persistent symptoms, see a doctor rather than relying on a website or a supplement.
Any dietary supplement discussed is for adult men 18 and over, is not intended for women or anyone pregnant or breastfeeding, and is not intended to diagnose, treat, cure or prevent any disease.
These statements have not been evaluated by the Food and Drug Administration. Individual results may vary.
Back to the Primordial Vigor X verdict, or see what the label doesn't disclose and our eight-point buyer's guide.