Getting the exact dosage of active ingredients into each gummy is the core of supplement manufacturing. A label claim only means something when the formulation, the mixing, and the testing behind it all hold up.
The Core Math: Step by Step
The basic formula for dosage per gummy is the total batch formula divided by the number of gummies. The calculation runs in four steps:
- Set your target per gummy. Decide the amount of active each gummy should deliver. For a vitamin D3 gummy, one common target is 25 mcg (1,000 IU) per piece.
- Scale it up for the batch. Multiply the per-gummy dose by the number of gummies. A 100,000-piece batch at 25 mcg each needs 2,500,000 mcg, or 2.5 g, of active in the total mix.
- Convert to raw material using the CoA. Active ingredients ship in diluted, carrier-based forms, and the certificate of analysis (CoA) states the potency. Divide your target by that potency: raw material = target active ÷ potency fraction. A gummy-grade vitamin D3 powder at 100,000 IU/g is 0.25% cholecalciferol by weight, so the 2.5 g of pure active arrives as 1 kg of powder.
- Account for process loss and degradation. Mixing, depositing, and handling lose a small part of the batch, and the active degrades over the shelf life. Build both into the formula as overage so the finished gummy still meets the label claim at expiry.
Overage and the 100% Label Claim
FDA regulations require a supplement to contain at least 100% of each labeled dietary ingredient amount through its full shelf life. That rule is why manufacturers build in an overage. You formulate above the label claim so that normal degradation during storage never drops the gummy below what the label promises.
The right overage comes from stability data, not a guess. An ingredient that holds up well in storage needs little margin; one that fades in humid conditions needs more. Run the overage too low and the product fails assay at expiry. Run it too high and the FDA can view the excess as adulteration. The CoA tells you what you are putting in; a stability study tells you how much of it survives.
Why Professional Manufacturing Matters
The arithmetic is simple, but making every gummy in a batch match that arithmetic is where manufacturers earn their margin. It requires:
- Precision mixing that disperses the active evenly through a viscous pectin or gelatin mass.
- Validated depositing so each mold cavity receives the same fill weight of the blended mass.
- Finished-product assay, by HPLC, to confirm the active content matches the calculated target and the label claim. For gummies, USP General Chapter <2091> sets weight-variation limits used alongside that assay.
The surest way to get accurate dosage every time is to work with a contract manufacturer who does this daily. At KorNutra, we handle formulation, blending, depositing, and third-party testing, so each gummy delivers what the label claims. That's how you build trust and stay compliant.