Material guide: benzyl salicylate — barely smells of anything, and can take a tenth of the formula

Someone asked a good question on the forum: if Iso E Super and hedione should not go into everything, what else can hold the large-volume slot in a formula? Plenty of materials go wrong in quantity, he noted, and adding more linalool does not help. Thirty-one replies.

This is one of the answers. It ranks 11th in our corpus with a median dose of 9.47%, among the heaviest in the top fifteen.

The short version

• The database rates its strength as low, with odour descriptors of balsamic, clean, herbal, oily and sweet. It barely competes for attention.
• Yet it holds 384 hours on a blotter. Low strength plus long life is exactly what makes heavy use possible.
• It occurs naturally in ylang ylang and carnation absolute. This is not a purely laboratory molecule.
• Two recent papers are worth knowing. One places it inside plant salicylic acid biosynthesis; the other is in vitro endocrine mechanism work. The second needs careful reading.

The basics

CAS	118-58-1
Chemical name	Salicylic acid, benzyl ester
Formula	C₁₄H₁₂O₃
Molecular weight	228.25
Type	Naturally occurring, also synthesised
Odour	Balsamic, clean, herbal, oily, sweet
Odour family	balsamic
Strength	Low
Longevity	384 hours (blotter, neat)
Appearance	Colourless to pale yellow clear oily liquid to solid
Boiling point	208 °C @ 26 mmHg; 168–170 °C @ 5 mmHg
Flash point	180 °C
Specific gravity	1.173–1.181 @ 25 °C
Refractive index	1.579–1.583 @ 20 °C
logP	3.20 (est)
Natural occurrence	Ylang ylang oil 1.37%, ylang CO₂ extract 3.66%, carnation absolute 3.90%, narcissus absolute 0.17%, jasmin, clove
Storage	24 months or longer; cool, dry, sealed, away from heat and light
Regulatory	FEMA 2151, JECFA, CoE, FLAVIS
Suppliers	58
Corpus rank	11th (159 of 954 formulas, 16.7%, median dose 9.47%)

In plain terms. A specific gravity of 1.173 means it sinks in water, which is unusual — most fragrance materials float. A refractive index of 1.58 is also high, and the two together make an easy identity check when a shipment arrives. The 180 °C flash point is extremely high, so transport and storage impose almost nothing.

Why "low strength" is the point

Beginners tend to equate strength with value, as though a stronger material buys more per gram. This one demonstrates the opposite use.

Low strength means that for the same weight it delivers less odour signal than its neighbours. Building a composition around it will fail. Turn that around, though, and you can put a lot of it in without shoving the formula sideways, and those grams are not empty: they hold up the body, keep the fast material around longer, and fill the gap that makes a formula read thin.

The 384-hour record is the key half. It moves slowly on its own, so it is still present through the back half of the wear. This is fixation as a concrete case rather than a concept.

Worth repeating that the hours field measures neat material on paper, not diluted material on skin, and the two do not convert.

What 9.47% actually means

Line up median doses across the top of the corpus:

Material	Appears in	Median dose
Phenethyl alcohol	28.7%	10.00%
Benzyl salicylate	16.7%	9.47%
Hydroxycitronellal	16.9%	8.00%
Alpha-hexyl cinnamaldehyde	16.5%	8.00%
Hedione	17.3%	7.00%
Linalool	35.4%	5.93%
Eugenol	16.9%	1.70%

Linalool, the most frequent material in the corpus, carries a median dose of 5.93%. This one, ranked 11th by frequency, carries 9.47%. Appearing often and being used heavily are different properties, and anyone asking what fills the large-volume slot should be reading the right-hand column.

It has a day job inside plants

A 2025 paper by Ma and colleagues in The Plant Cell puts this material in a completely different frame.

Plants make salicylic acid by two routes, and in the PAL route the steps between benzoyl-CoA and salicylic acid had stayed unresolved. The authors used CRISPR/Cas9 to knock out benzaldehyde synthase in poplar, and the resulting plants made less benzyl benzoate, less benzyl salicylate and less salicylic acid, while accumulating more benzoic acid. They then showed that the gene HSR203J encodes a carboxylesterase that specifically hydrolyses benzyl salicylate; silencing it in Nicotiana benthamiana reduced the conversion of benzyl salicylate to salicylic acid.

Their model: benzoyl-CoA is esterified to benzyl benzoate, converted to benzyl salicylate, and the ester then releases salicylic acid. The fragrance material is an intermediate on that route.

Salicylic acid is a defence signalling molecule in plants. What we buy for body in a formula is, for a poplar, a transit point. None of this changes how you use it, and it does explain why the molecule turns up naturally in ylang ylang and carnation rather than by coincidence.

An in vitro study to read carefully

In 2026, Dai and colleagues published in Toxicology and Applied Pharmacology on 15 salicylate esters and their inhibition of 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2), the enzyme that metabolises cortisol and provides the placental glucocorticoid barrier.

Benzyl salicylate was the most potent inhibitor of the fifteen, with an IC50 of 18.53 μM against the human enzyme and 29.25 μM against rat. Surface plasmon resonance showed direct binding to human 11β-HSD2 with a KD of 21.6 μM and suggested interference with NAD⁺ binding. In BeWo cells, a placental-derived line, the active salicylates reduced cortisone production under largely non-cytotoxic conditions.

Read this one carefully. It is mechanistic in vitro work: purified enzyme kinetics, SPR binding, a cell line, molecular modelling and an exploratory network toxicology analysis. The authors' own conclusion is that it provides mechanistic evidence for potential interference with glucocorticoid metabolism in vitro. It does not assess human exposure, and it does not convert those micromolar concentrations into anything reached by material on skin.

It is here because this material carries a median dose of 9.47%, which puts it among the heavily used, so new mechanistic work is worth knowing about and worth watching to see whether RIFM and IFRA fold it into a future assessment. How to read fragrance safety studies covers the general principle: mechanistic in vitro work raises a question rather than delivering a verdict.

When you smell it

• Smell it neat, then admit it is boring. That is the correct reaction. Its value does not show up in isolation.
• Run an A/B once. Build a small formula in two versions, one with 8% of this and one without, everything else identical. The difference sits in the body and the back half, not the opening. That experiment teaches more than ten articles.
• Watch the oiliness. Push the level higher and the oily texture starts asserting itself, and the formula turns slightly cloying.
• Put it beside ylang ylang oil. The oil already contains 1.37% of it. Picking that out gives you a concrete instance of what "a natural oil is a mixture" means.

Buying and storage

With 58 suppliers this is easy to source. The naming is simple — benzyl salicylate, or salicylic acid benzyl ester — and the CAS is 118-58-1.

At room temperature it may be liquid or close to solid depending on purity and temperature, which is normal. The 180 °C flash point removes fire concerns from storage. Seal it, keep it dark, and the labelled shelf life is 24 months or longer.

Because the usage level is high, this is one of the few materials worth buying in quantity. At a median 9.47%, a 100 gram batch of concentrate consumes nearly 10 grams of it.

Regulatory and safety

Four GHS statements: H317 may cause an allergic skin reaction, H319 causes serious eye irritation, H371 may cause damage to organs, H401 toxic to aquatic life. The last two are less common among fragrance materials, so wear gloves and eye protection, and do not pour waste down the sink.

Acute toxicity: oral rat LD50 2,227 mg/kg, dermal rabbit LD50 14,150 mg/kg.

It is one of the fragrance substances the EU requires to be named on a cosmetic ingredient list. Register listings are FEMA 2151, JECFA, CoE and FLAVIS, and registers themselves carry no limit values. For skin and consumer products, check current IFRA Standards and your market's rules — here is how to check that yourself.

→ Benzyl salicylate in the database: full physical data, 58 suppliers and suggested blends. → Search by odour: try "balsamic sweet clean".

References

D. Ma et al., Salicylic acid biosynthesis via the PAL pathway requires benzaldehyde synthase and a benzyl salicylate-specific esterase, The Plant Cell, 37(10), koaf241 (2025). PMID 41092096. doi:10.1093/plcell/koaf241

Y. Dai et al., Salicylate esters inhibit human and rat 11β-Hydroxysteroid dehydrogenase type 2: Mechanistic insights from enzyme kinetics, SPR, and molecular modeling, Toxicology and Applied Pharmacology, 514, 117939 (2026). PMID 42419492. doi:10.1016/j.taap.2026.117939