Vitamin B3 (Niacin) forms for supplement manufacturing

How the vitamin B3 forms compare

Two vitamin B3 forms cover most EU food-supplement work: nicotinamide and nicotinic acid. Their molar masses differ by under 1 % (122.12 vs 123.11 g/mol), so a gram of either supplies almost the same niacin. The choice turns on solubility, taste, acidity and national maximum levels, not on content.

The molar figures come straight from the molar masses: 123.11 / 122.12 = 1.008. Both molecules carry one pyridine-3-carbonyl unit, so content is never the reason to pick one form over the other.

The practical differences come from chemistry. Nicotinamide is the amide: neutral, readily soluble in water and slightly bitter. Nicotinic acid is a carboxylic acid: acidic in solution, less soluble in cold water and sour rather than bitter. In a liquid, drink powder or effervescent tablet, nicotinamide dissolves without residue and does not shift pH.

Both forms are among the more stable vitamins to heat, light and oxidation. Overages are usually smaller than for sensitive vitamins, but the figure should come from your own stability data on the finished product. The overage calculator handles the arithmetic once you have it.

Choosing a form

No single form is best for every product. The decision points below separate them in practice.

• Label claim per capsule or tablet. Fill weight does not decide the choice. To declare 20 mg of niacin per tablet you need 20 mg of nicotinic acid, or 19.8 mg of nicotinamide on a strict molar basis. Confirm with your regulatory team whether your authority counts the two forms mass for mass.
• Format. For powders and sports nutrition, drinks and effervescent tablets, nicotinamide is the usual choice because it dissolves readily. In tablets and capsules, either form works.
• Taste. At typical multivitamin inclusion levels the amount is small, so taste rarely limits. In single-nutrient chewables or gummies, nicotinamide’s bitterness needs masking.
• pH and compatibility. Nicotinic acid adds acidity to a blend. That matters little in a dry tablet but can matter in liquids, carbonate-containing systems or pH-sensitive actives.
• Premixes. Nicotinamide is the form most often combined with vitamin B1, vitamin B2 and vitamin B6 in B-complex premixes, because it handles well in both wet and dry processes.
• Cost per milligram of niacin. Because content per gram is almost identical, compare quoted prices per kilogram directly.
• Regulatory status. National maximum levels may treat the two forms differently, which can decide the form for a high-content product. See the next section.

SoleChem sends the specification sheet and certificate of analysis for either form with its quote. The specification states assay, particle size and the reference standard the grade meets; ask for the grade you need in the quote form.

EU regulatory status

Niacin is listed in Annex I of Directive 2002/46/EC, the list of vitamins and minerals that may be used in food supplements. Annex II of the same Directive lists nicotinic acid and nicotinamide as permitted sources of niacin. The guide to permitted forms explains how Annexes I and II work together.

For fortified foods other than supplements, Regulation (EC) No 1925/2006 contains its own list of permitted forms. Check that list separately if the same material goes into a fortified food.

When nicotinic acid is added as a niacin source, it is used as a nutrient under Directive 2002/46/EC, not as a food additive. It is declared as niacin, not by an E number. Any additive use would have to be checked against the Union list in Regulation (EC) No 1333/2008.

The EU has not yet set harmonised maximum levels of vitamins in food supplements. Member states set their own, and the figures differ. Some national schemes may set one limit for niacin and others separate limits for nicotinic acid and nicotinamide. Check the rule in each target market with its competent authority; the guide to maximum levels by EU country explains how these schemes work.

On the label, niacin content is declared under the rules of Directive 2002/46/EC, alongside the general rules of Regulation (EU) No 1169/2011. The labelling guide covers units and percentage reference values.

Any authorised health claims for niacin, with their exact wording and conditions of use, are listed in the EU Register of nutrition and health claims, under Regulation (EC) No 1924/2006. Our health-claims guide explains how to use the Register.

Annex II also lists inositol hexanicotinate and nicotinamide riboside chloride as niacin sources; these are outside the scope of this page. Nicotinamide riboside chloride is also a novel food, so its conditions of use fall under Regulation (EU) 2015/2283 and the Union list of novel foods. The novel food guide describes how to check an ingredient’s status. More vitamin forms are listed under Vitamins.