Bespoke multivitamin manufacturing

Private label multivitamins for women, men, teens and over-50s

Private label multivitamins and bespoke formulas for premium brands are developed and made at our Leicester facility, where we act as their contract manufacturer from the first formula to the finished product. We build targeted formulas for a defined person, such as women, men, teens, adults over 50 or people using GLP-1 medicines, as tablets, capsules, gummies, effervescent tablets, powders, sachets, stick packs and liquids. Every nutrient sits between the source level its authorised claim needs and EFSA's upper level, with overages sized from stability data so the label holds to the end of shelf life, and every batch comes with a certificate of analysis. Your formula is yours.

Each nutrient's form sets its absorption, taste, stability, unit size and label wording. We choose every form from Great Britain's list of permitted forms and the EU's, and every form in the table is on both.

Grades matter as much as forms. We specify coated grades of vitamin C and iron where they would react or taste, and dry, spray-dried grades of vitamins A, D, E and K that blend evenly into tablets and powders. Every supplier passes our approval before any material is used. For programmes that need supply security, we approve a second source for critical vitamins wherever the market offers one.

Dose windows, mineral clashes and overages in a multivitamin

Development runs as a paid R&D stage, which can be included with an order of the right size. It moves from your brief and an evidence review to the formula, bench samples, a pilot batch and stability studies in your final pack, and each stage leaves a record your brand keeps.

Between the source level and the upper level

We set every nutrient between two lines. The lower line is the source level an authorised claim needs: 15% of the nutrient reference value per daily dose, such as 0.75 µg of vitamin D or 1.5 mg of zinc. The upper line is EFSA's upper level, with headroom for the strictest market you sell in: 100 µg of vitamin D, 12 mg of vitamin B6, 1,000 µg of folic acid, 25 mg of zinc and 255 µg of selenium a day for adults (EFSA, 2025). Calcium and magnesium cannot both fit into one unit at their full reference values of 800 mg and 375 mg: a size 00 capsule holds just under 1 ml of powder.

When calcium, iron and zinc compete

Nutrients compete inside a formula. Calcium reduces non-haem iron absorption and vitamin C increases it, and zinc competes with iron and copper. So we balance mineral ratios, keep high-dose iron away from high-dose calcium, and use bilayer tablets or split morning and evening servings where two nutrients clash. Vitamins A, D, E and K are fat-soluble, so the directions pair them with a meal.

Stability, overages and tolerances

Vitamins lose potency at different rates. Vitamin C degrades with moisture and oxygen, vitamins A and D with oxygen and light, and folic acid and riboflavin with light, so a multivitamin is only as stable as its weakest nutrient. An overage is extra nutrient added so the label still holds at the end of shelf life.

The European Commission's guidance on tolerances accepts vitamins in food supplements from 20% below to 50% above the declared value, and minerals from 20% below to 45% above, measurement uncertainty included, throughout shelf life. Legal maximum amounts take priority over the upper tolerance. US labels need at least 100% of the declared amount of each added nutrient. We size each overage from losses measured in stability studies on your product and pack, so a formula sold in both markets meets 100% at expiry and stays inside the EU upper tolerance at release.

Tablet, capsule or gummy: how much of the formula fits

The format decides how much of a full formula fits in a daily serving, and how the customer takes it. We make every format below in Leicester, in a facility that is ISO 9001, HACCP and GMP certified by BSI, and FDA registered. BRCGS implementation under way, certification expected in early 2027.

• Tablets pack the most nutrients per unit, take film coats that mask taste and ease swallowing, and allow bilayer designs that keep reactive nutrients apart. See capsule and tablet manufacturing.
• Capsules are GMP certified and hide taste with few excipients, but hold less, so a complete formula with useful amounts of calcium and magnesium runs to several capsules a day.
• Gummies are GMP certified, with an active assay on every batch as standard. They build a daily habit for vitamins D, B12 and C and folic acid; calcium, magnesium and iron need too much room or taste work, so gummy multis carry fewer minerals. See gummy manufacturing.
• Effervescent tablets dissolve vitamin C, B vitamins and minerals into a drink. See effervescent tablet manufacturing.
• Powders, sachets and stick packs carry gram doses of minerals alongside protein, fibre or greens. See powder supplement manufacturing and greens powder manufacturing.
• Liquids and drops suit children's ranges and microgram nutrients, and are GMP certified.

A multivitamin pairs well with an omega-3 softgel in a daily pack; see omega-3 supplement manufacturing. B vitamins, iron and magnesium also anchor our energy supplements.

Why a multivitamin legal in one country can be refused in another

UK and EU labels and national maximums

As of October 2026, a GB or EU label says "food supplement", names the nutrient categories, and gives the daily portion with a warning not to exceed it, a varied-diet statement and a warning to keep the product out of reach of young children. Each vitamin and mineral is declared per daily portion with its percentage of the reference value. Authorised claims, such as "Vitamin D contributes to the normal function of the immune system" or "Vitamin B12 contributes to the reduction of tiredness and fatigue", need each nutrient at least at a source level.

Great Britain sets no statutory maximum levels. In the EU, national maximum amounts apply where member states have set them, so a multivitamin legal in one country can be refused in another. EU maximum levels for vitamins and minerals in food supplements are under review, so we design EU formulas with a ready alternative. Our vitamin and mineral supplement manufacturing hub covers the rules across the category.

US iron warnings and California's prenatal testing

A US label says "dietary supplement" and carries a Supplement Facts panel with each nutrient's % Daily Value. Structure/function statements need substantiation, notification to FDA and FDA's mandatory disclaimer. Iron supplements in solid forms, gummies included, carry FDA's boxed accidental-overdose warning, and packs holding 250 mg or more of elemental iron need child-resistant packaging. From 1 January 2027, California requires a representative sample of every lot of a prenatal multivitamin to be tested for arsenic, cadmium, lead and mercury at an ISO/IEC 17025 accredited laboratory, with the results published by the brand and a statement on the pack pointing to them; we arrange that testing and supply the reports.

Pre-blends, granulation and film coats for multivitamin tablets

Our HACCP study for each product type, reviewed annually, sets the critical control points. A multivitamin runs through these steps at our Leicester facility.

1. Approve and receive. Every vitamin and mineral comes from a supplier approved before first use, with its certificate of analysis checked against our specification.
2. Weigh and dispense. Each material is weighed against the batch record, under our allergen management plan with yellow colour coding.
3. Pre-blend. Microgram nutrients such as vitamin D, vitamin B12, folic acid and selenium are diluted step by step into a carrier, so every unit carries its dose.
4. Blend and granulate. The premix joins the main blend, and dense or poorly flowing blends are granulated before pressing.
5. Press, fill or deposit. Tablets are compressed and checked in process for weight, hardness and disintegration; capsules are filled and checked for fill weight; gummies are deposited with heat-sensitive vitamins added late.
6. Coat and pack. Tablets take a film coat. Units go into bottles with desiccant or into blisters, with label verification on every batch as our critical control point, CCP-01.
7. Retain and release. We keep three retained samples per batch for shelf life plus one year, and quality control releases each batch against its specification.

Lab tests to expect from a multivitamin manufacturer

Every batch is tested by accredited partner laboratories (ISO/IEC 17025), and batch testing is part of every order. Nothing is dispatched without quality control sign-off. Our testing and batch release page explains each method.

Stability studies run on every new formula, so the overage, the pack and the best before date rest on measured data. You receive a certificate of analysis for every batch, with each result against its specification limit, and from development the specification, the stability data and the claims review for each market. When your formula is ready to brief, Start your project.

References: Loftfield and colleagues, JAMA Network Open (2024); Vyas and colleagues, American Journal of Clinical Nutrition (2024); COSMOS investigators, Nature Medicine (2026); Tripkovic and colleagues, American Journal of Clinical Nutrition (2012); European Commission, guidance on tolerances for nutrient values declared on a label (2012); Directive 2002/46/EC on food supplements (2002); 21 CFR Part 101 (2026); California SB 646, Chapter 602, Statutes of 2025 (2025).