Musk in Perfumes — Natural vs Synthetic, and Why It Matters

Musk is one of the oldest and most prized perfumery ingredients in human history. For centuries it was harvested from the glands of the musk deer (Moschus moschiferus) — a small deer native to the mountains of Central Asia. Today natural musk is banned, but synthetic alternatives form the foundation of almost every modern fragrance composition. The catch is that not all synthetics are equally safe.

Natural Musk — From Luxury to Ban

Natural musk (muscone) was obtained from the musk pod of male musk deer — a gland about the size of a walnut, containing roughly 30 g of musk substance. To obtain 1 kg of pure musk, between 30 and 50 animals had to be killed.

The consequences were predictable. The musk deer population fell dramatically — it is estimated that more than a million animals were killed for musk alone during the 20th century. In 1979 the species was listed under the CITES Convention (Appendix I), which means a complete ban on international trade. Despite this, illegal poaching continues — particularly in China, Mongolia and Russia, where natural musk fetches a price of up to USD 45,000 per kilogram (more expensive than gold).

In Europe, the use of natural animal musk in cosmetics is effectively banned — both by CITES regulations and by EU Regulation 1223/2009 on cosmetic products.

First Generation — Nitro Musks (1888–the 1990s)

The first synthetic substitute was Musk Xylene, discovered by chance in 1888 by Albert Baur during experiments with TNT (trinitrotoluene). Nitro musks — Musk Xylene, Musk Ketone, Musk Ambrette and Musk Tibetene — dominated the market for over 100 years thanks to their low production cost.

The problem came to light in the 1980s and 1990s, when research revealed serious health risks:

• Musk Ambrette — neurotoxicity and phototoxicity. Banned in the EU in 1995.
• Musk Tibetene — banned in the EU due to its mutagenic potential.
• Musk Xylene — bioaccumulation in fatty tissue, detected in breast milk. Restricted in the EU (max. 1% in fine perfumery products since 2009).
• Musk Ketone — similar restrictions to Musk Xylene, although considered less toxic.

A study published in Chemosphere (Rimkus, 1999) found nitro musks in the fatty tissue of fish, molluscs and humans — evidence of their environmental persistence and bioaccumulation in the food chain.

Second Generation — Polycyclic Musks (since the 1960s)

Polycyclic musks were meant to be a safer alternative. The two most important are:

• Galaxolide (HHCB — 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-γ-2-benzopyran) — the most widely used synthetic musk in the world. Estimates suggest it accounts for more than 60% of total synthetic musk consumption globally.
• Tonalide (AHTN — 7-acetyl-1,1,3,4,4,6-hexamethyltetrahydronaphthalene) — the second most popular, widely used in detergents and cosmetics.

Polycyclic musks do not show the same strong toxicity as nitro musks, but they have a different problem: environmental pseudo-persistence. A study by the Umweltbundesamt (German Environment Agency, 2018) found HHCB and AHTN in:

• Treated wastewater — treatment plants remove only 50–80% of these compounds.
• Surface waters — rivers near urban conurbations.
• Aquatic organisms — fish, mussels, benthic organisms.
• Breast milk — studies in Germany, Denmark and the Netherlands confirmed the presence of HHCB in concentrations of up to 7.8 µg/kg of milk fat.

In addition, concerns arose about endocrine activity. An in vitro study (Schreurs et al., 2004, Toxicological Sciences) showed that HHCB exhibits weak estrogenic activity — although the clinical implications of this finding are still under debate.

Third Generation — Macrocyclic Musks (the Industry's Future)

Macrocyclic musks are compounds with large-ring structures (12–17 carbon atoms) that most closely resemble the scent of natural muscone. They include, among others:

• Habanolide (Ethylene Brassylate) — a powdery, delicate musky tone.
• Exaltolide (15-Pentadecanolide) — a creamy, leathery musk.
• Muscenone — the closest in scent to natural muscone.
• Cosmone — used as a substitute in niche perfumes.

The key advantage of macrocyclic musks:

1. Biodegradability — they break down in the environment within weeks, not years.
2. No bioaccumulation — they do not build up in the tissues of living organisms.
3. No endocrine activity — studies to date have shown no effect on the hormonal system.
4. Scent profile — closest to natural musk, valued by perfumers.

Their main drawback is production cost — macrocyclic musks are 3–10 times more expensive than polycyclic ones. That is why Galaxolide still dominates mass-market products (detergents, fabric softeners, cheap cosmetics), while macrocyclic musks appear mainly in premium and niche perfumes.

How to Identify the Type of Musk in Your Cosmetics?

Unfortunately, this is difficult. Synthetic musks are usually hidden under the umbrella term “Parfum” on the INCI list and are not subject to individual declaration requirements (they are not on the list of 26 allergens from Annex III). Some clues:

• COSMOS/Ecocert certificates — prohibit nitro and polycyclic musks, allow macrocyclic ones.
• “Musk-free” declarations — some brands deliberately avoid synthetic musks.
• Price and positioning — niche and premium perfumes more often use macrocyclic musks.
• Transparency of composition — brands like Byredo or Le Labo publish full lists of fragrance ingredients.

Check the safety profile of the ingredients in your perfumes using the PurScore search engine — we also assess the presence of synthetic musks wherever manufacturers disclose the full composition.