How TrueServing Works

The Problem

If you've ever tried to compare supplement prices on Amazon, you know the drill: open a dozen tabs, scroll through product images hunting for the Supplement Facts label, squint at the serving size, do the mental math on how many servings you'd actually take per day, then try to remember what the last three products cost per milligram. Most people give up and just buy the one with the best reviews.

The supplement industry makes this hard on purpose. A product titled "Resveratrol 500mg" might only contain 250mg of trans-Resveratrol per serving — the rest is grape seed extract and red wine extract. A bottle advertising "1000mg NMN" might require two capsules per serving, cutting the supply in half. Two bottles at the same price can deliver wildly different value.

And it's not just ingredients. Serving sizes are another common source of confusion.

What TrueServing Does

TrueServing normalizes every product to one number: your real cost per month at the daily dose you choose. No more mental math, no more tab-switching, no more guessing. You pick your supplement, set your dose, and instantly see every product ranked from cheapest to most expensive — based on what actually matters.

How the Data Works

We use AI vision to read the actual Supplement Facts panel from each product's Amazon listing — the same label you'd see printed on the bottle. The system identifies the active ingredient, extracts the amount per serving, and calculates cost per milligram. This means the data reflects what's actually in the product, not what the marketing title claims.

Products with misleading titles are caught automatically — our system reads the label, not the headline.

What We Filter Out

Not every Amazon listing makes it to the comparison page. We exclude true combination products — supplements that combine two or more primary active ingredients, like an "NMN + Resveratrol" stack. These break apples-to-apples comparison because you can't isolate the cost of one ingredient. Products with secondary ingredients like BioPerine, Vitamin D, or black pepper extract are included normally — they have a single active ingredient that can be fairly compared.

We also exclude products with fewer than 10 reviews and products without complete serving data. If a product is missing, it's likely filtered for one of these reasons — and you can request it through the feedback link.

Affiliate Disclosure

TrueServing participates in the Amazon Associates program. We earn a commission when you purchase through our links at no extra cost to you. This is how we keep the site free. Rankings are based entirely on calculated cost — we don't accept payment for placement.