Royal Jelly: What It Is, Forms & How to Read a Label

Royal jelly is not gathered from flowers, and the colony never stores it in the comb: young worker bees secrete it from glands in their heads and feed it, directly, to the colony's young. It is a fresh glandular secretion, not a shelf-stable crop — the forms it is sold in, the label numbers and the cold chain all follow from that.

What is royal jelly?

A secretion of the hypopharyngeal and mandibular glands of young worker (nurse) bees. Every young larva is fed it in its first days; a larva reared in a queen cell is supplied with it in over-abundance, and the adult queen continues to be fed it. Because it is fed directly rather than stored, royal jelly accumulates only in queen cells — which is why it is harvested during queen rearing, and why it has never been a bulk crop like honey.

What is fresh royal jelly like?

A whitish substance with the consistency of a fairly fluid paste, a sharp smell and a sour taste. It is markedly acidic — pH 3.4 to 4.5 — and mostly water: 60–70% of the fresh weight, with proteins at 9–18%, sugars at 7–18% and lipids at 3–8%. Stored warm, its proteins begin to break down, which is why the fresh product is sold chilled or frozen and travels packed cold.

What is 10-HDA?

10-hydroxy-2-decenoic acid — a fatty acid characteristic of royal jelly's lipid fraction, and the trade's routine marker for whether a product is genuine royal jelly and how much is present. The standardisation literature sets reference minimums of 1.4% 10-HDA for fresh royal jelly and 3.5% for freeze-dried. Read it the way an MGO number is read on a manuka label — a measured concentration, a promise of nothing beyond composition. Two facts help a buyer: 10-HDA falls as royal jelly is stored, and faster still when it is blended into honey.

What forms is it sold in?

Three. Fresh royal jelly comes in small pots, chilled or frozen. Freeze-dried — lyophilised — royal jelly has had its water removed and goes into capsules or powder: fresh royal jelly is 60–70% water and the powder under 5%, so a gram of freeze-dried represents roughly three grams of fresh — the arithmetic behind the “fresh equivalent” figure on capsule labels. Blends of royal jelly in honey typically carry 1–3% royal jelly. Our guide to buying royal jelly in the UK takes the three forms shelf by shelf.

How do you read a royal jelly label?

Look for four things: the 10-HDA percentage and its basis — fresh or freeze-dried, 1.4% against 3.5%; the fresh-equivalent line on capsules, checked against the arithmetic above; the origin, country at minimum; and on a honey blend, the declared royal jelly percentage. With fresh royal jelly, add a fifth: how it reached you. A fresh product offered at room temperature is its own answer.

Fig. I · The number and its basisDiagram

A 10-HDA percentage is read with its basis — fresh or freeze-dried

10-HDA is the trade’s routine marker for whether a product is genuine royal jelly and how much is present — a measured concentration, a promise of nothing beyond composition. The figure moves with the form because the water does.

Water, as a share of the product

Fresh royal jelly60–70% water

The bar runs to 60% and hatches across to 70% — the stated range, not a single value. Stated with it, on the same fresh weight: proteins 9–18%, sugars 7–18%, lipids 3–8% — components the page lists, not a balance it closes.

Freeze-dried — lyophilisedunder 5% water

An upper limit, not a measured value — the bar is drawn open at its end for that reason. Protein 27–41%.

0100% of the product’s weight

Freeze-drying takes the water below 5%, concentrating the solids roughly three-fold:1 g of freeze-dried represents roughly 3 gof fresh — the arithmetic behind the “fresh equivalent” figure on capsule labels.

The 10-HDA reference minimum, on its own basis

Fresh royal jelly1.4%

Freeze-dried — lyophilised3.5%

Royal jelly in honeyNone given on this page

A blend declares a different quantity: the royal jelly percentage in the jar — typically 1–3% — not a 10-HDA basis.

Reference minimums, not measurements of any pot: 10-HDA falls as royal jelly is stored, and faster still when it is blended into honey.

The same standardisation literature sets both figures; the rise from 1.4% to 3.5% is the water leaving. Read the percentage with its basis.

How should it be stored?

Fresh royal jelly goes in the refrigerator short term and the freezer for anything longer: its measured composition holds at 4°C, but studies of stored royal jelly found the proteins keep best frozen, and the production literature recommends freezing it as soon as it is harvested. Freeze-dried royal jelly is more stable than fresh — that is the point of freeze-drying. A honey blend keeps like honey, but its 10-HDA declines faster than in royal jelly stored alone.

Who should avoid it?

Royal jelly is a documented allergen, and some recorded reactions are serious. A 1996 case series described asthma and, in some cases, anaphylaxis in seven people after eating royal jelly, and concluded these were true IgE-mediated allergic responses. Australia and New Zealand require royal jelly products to carry a statement that royal jelly “has been reported to cause severe allergic reactions and, in rare cases, fatalities, especially in asthma and allergy sufferers”. That wording is law on the other side of the world; the substance is the same on a UK shelf. A honey blend is still honey: not suitable for infants under 12 months, because honey can contain bacteria associated with infant botulism.

Royal jelly and the rest of the hive

Royal jelly is often confused with bee pollen. They are different things — pollen is gathered from flowers, royal jelly is made by the bee — and our bee pollen vs royal jelly guide keeps them straight. THYMELIA is a UK house for Cretan bee products. Royal jelly is the hive product most changed by handling, so the questions above — fresh or freeze-dried, how cold, how long — are the first we put to a producer. What we test is at testing. And what the published research on royal jelly has actually measured — the queen-cell biology, the human trials, the GB register — is reviewed source by source at royal jelly benefits: what the research actually shows.