Zinc is one of the safest bets in private label. It is a single-ingredient product, it sells all year, it combines naturally with vitamin C and elderberry, and it works in every dosage form a factory already runs. It is also a category where the label matters more than the marketing: two products both claiming "zinc 25 mg" can behave very differently depending on which salt the formulator chose. This guide covers the decisions a buyer should make before briefing a manufacturer.
The salt form decides everything
Zinc is always dosed as a compound, never as the bare metal, so the first question is which salt — and that choice sets elemental content, cost, capsule size and stomach tolerance.
- Zinc oxide — the cheapest and the highest in elemental zinc per gram, which keeps the capsule small. Absorption is lower than the chelated forms.
- Zinc sulphate — inexpensive and well documented, but the most likely to cause nausea on an empty stomach.
- Zinc gluconate — a middle option, common in lozenges and gummies.
- Zinc citrate — better absorbed than oxide, mild on the stomach, widely used in capsules and drops.
- Zinc picolinate — a chelate marketed on absorption; bulkier, so it needs a larger capsule for the same declared dose.
- Zinc bisglycinate — chelated to the amino acid glycine, the gentlest option and the one least likely to be affected by other minerals in the same blend.
Because elemental content differs so much between salts, the nutrition panel figure and the fill weight are not the same number. Always confirm which figure the label is declaring before artwork goes to print.
Combination products
Most commercial zinc SKUs are combinations, and they are the easiest way to differentiate:
- Zinc + vitamin C — the classic capsule pairing, and the format buyers ask for most often.
- Zinc + elderberry — usually a gummy or a lozenge.
- Zinc + magnesium — a common night-time positioning; watch total fill weight, because both are bulky.
- Zinc + vitamin D3 — frequently requested for winter ranges.
One practical caution: zinc competes with other minerals for absorption. If the brief includes iron or high-dose calcium in the same capsule, expect the formulator to recommend splitting the dose across two products rather than crowding one shell.
Which dosage form to choose
- Capsules — the most flexible and the easiest to standardise; size 0 or 00 covers most adult doses.
- Tablets — the lowest cost per dose at volume, though zinc blends can be abrasive on tooling and may need extra lubrication.
- Gummies — the strongest consumer-facing format, but zinc has a metallic note that needs a robust flavour system.
- Drops — a growing format, sold in 30 ml or 60 ml bottles; dosing is per-drop, so accuracy of the dropper matters more than in a capsule.
- Sprays — an oral spray is a niche but sticky-loyal format; confirm your destination market accepts it as a supplement rather than a cosmetic.
See our capsules, gummies, tablets and liquid drops ranges.
Taste, overage and stability
Zinc tastes metallic and can leave an aftertaste, which is why gummies and drops need a heavier flavour load than capsules. On stability, zinc salts are far more robust than vitamins — the practical concerns are moisture pick-up in the blend and, in gummies, colour drift over shelf life. Formulators typically apply a small overage to stay above the label claim at end of shelf life; that overage must sit inside the destination market's rules.
Testing and documentation
Incoming zinc salts and finished batches should be covered by:
- Assay — confirming the declared elemental zinc content, not just the weight of the salt.
- Heavy metals — lead, cadmium, arsenic and mercury, which is where mineral raw material most often fails.
- Microbiology — total plate count, yeast and mould, and where relevant Salmonella and E. coli.
- Dissolution or disintegration — particularly for tablets and capsules.
Ask for a Certificate of Analysis with every batch. A supplier that cannot produce one for a mineral is not managing its supply chain.
Labelling by destination market
Every market sets its own reference value and upper level for zinc, and they do not agree with each other. The United States, the European Union, the Gulf and ASEAN each publish their own daily reference figure and maximum permitted level, and permitted claim wording differs too. Because the panel figure, the permitted claim and the maximum dose all move together, agree the panel with your manufacturer and regulatory advisor before the carton is printed — a reprint costs far more than the review.
MOQ, sampling and lead times
Zinc is one of the easiest categories to trial because it uses standard shells, bottles and cartons. A practical starting point is MOQ 500 units per SKU, samples in 3–5 days, production shipped within 7 days, and a COA with every batch. That lets a new brand test one formula before committing to a full range.
How Haiyue Shengda works
We produce zinc capsules, tablets, gummies, drops and sprays alongside the rest of our range in our own 5,000+ m² factory with 7 production lines and 34 machines, under FDA facility registration and HACCP, cGMP and ISO 22000. Custom formulations and outer-packaging design are free, with the first design sketch in about two hours. Browse our capsules range, read the FAQ, or contact us — we reply within one hour on working days.