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Royal Jelly, 10-HDA, and the Skin Barrier

Royal jelly is the secretion of the hypopharyngeal and mandibular glands of nurse honeybees. Worker larvae receive it for the first three days of life. The queen receives it for life. Folli-Activ includes royal jelly as one oral ingredient in a 10-in-1 formula. The papers opened for this essay document what the secretion contains and what a synthetic copy of its signature fatty acid did to skin-barrier proteins and to UV-dried skin. They are not a hair-count trial of oral royal jelly, and they are not a Folli-Activ study.

What is actually in the secretion

Ahmad, Campos, Fratini, Altaye, and colleagues review the composition. By weight, royal jelly is 60 to 70 percent water, 9 to 18 percent protein, 7 to 18 percent sugar, and 3 to 8 percent lipid. Minor constituents include minerals (iron, sodium, calcium, potassium, zinc, magnesium, manganese, and copper), eight essential amino acids (valine, leucine, isoleucine, threonine, methionine, phenylalanine, lysine, and tryptophan), and vitamins A, B complex, C, and E, plus enzymes, polyphenols, and nucleotides.

The lipid fraction is unusual. About 80 to 90 percent of its fatty acids are not the common long-chain fats. The review gives the breakdown of that fraction as 32 percent trans-10-hydroxy-2-decenoic acid (10-HDA), 22 percent 10-hydroxydecenoic acid, 24 percent gluconic acid, 5 percent dicarboxylic acids, and the remainder other acids. 10-HDA is the molecule people mean when they say royal jelly acid. Sugiyama, Takahashi, and Mori describe it as the principal lipid component and review its immunomodulatory activity, including inhibition of innate immune signals. Composition and immune-signal work are the royal jelly facts used on this page. A percentage of hair regrowth is not among them.

The B-complex line in the composition review is a vitamin class, not a measured biotin dose. Biotin has its own essay on this site because biotin deficiency includes hair loss. Royal jelly is not cited here as a biotin capsule.

The fatty acid, tested as Hydroxydecine, on skin

Duplan, Questel, Hernandez-Pigeon, Galliano, and colleagues studied Hydroxydecine, a synthetic counterpart of 10-hydroxy-2-decenoic acid, the fatty acid found in royal jelly. In cultured normal human keratinocytes, Hydroxydecine raised production of involucrin, transglutaminase-1, and filaggrin. In skin equivalents treated on the surface, staining for those three proteins increased. In a model of inflamed epidermis driven by thymic stromal lymphopoietin, an emulsion containing Hydroxydecine inhibited release of that cytokine. In living human skin explants with inflammation and a damaged barrier, a Hydroxydecine balm restored stratum corneum cohesion, increased filaggrin on immunohistochemistry, and lowered secretion of IL-4, IL-5, and IL-13.

In healthy volunteers with dryness induced by ultraviolet light, a Hydroxydecine cream raised the hydration index by 28.8 percent after 7 days (P less than 0.01) and by 60.4 percent after 21 days (P less than 0.001). The test article was a synthetic fatty acid in topical vehicles. It was not whole royal jelly swallowed as a capsule, and the endpoint was skin hydration and barrier proteins, not a scalp hair count. The link to the ingredient is chemical: 10-HDA is the fatty acid that makes up 32 percent of the unusual fatty-acid fraction of royal jelly, and that fatty acid, supplied as Hydroxydecine, moved filaggrin, involucrin, transglutaminase-1, and measured skin hydration.

Scalp skin is still skin

The scalp is skin that grows a keratin shaft. Filaggrin and involucrin are barrier proteins of the epidermis, and the Duplan experiments show a 10-HDA counterpart raising those proteins in keratinocytes, skin equivalents, and explants, then raising hydration in UV-dried skin. That is the skin-barrier reason royal jelly is discussed next to aloe in this formula. It is a different job from saw palmetto's 5-alpha-reductase work and from biotin's carboxylase work. Folli-Activ keeps those jobs in one bottle rather than asking royal jelly to stand in for an androgen inhibitor.

This page does not state that royal jelly increases hair count. The human study opened for the fatty acid measured hydration and barrier proteins, not hairs. A mouse experiment on topical whole royal jelly and shaft thickness is not used here as a growth claim, because that is not the result this essay is willing to state as a benefit.

Packs

Royal jelly is in Folli-Activ, a 90-capsule oral formula branded MY NPM FOLLI-ACTIV. On this site, 1 bottle is RM169, 3 bottles are RM447, and 6 bottles are RM699 with free shipping. Checkout is by card. The ingredient brings a defined secretion, 3 to 8 percent lipid, with trans-10-HDA as 32 percent of the characteristic fatty-acid fraction, into a formula whose other ingredients carry DHT, inflammation, keratin cofactor, and absorption roles.

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