Root Beer Flavor

Root beer began as a home-brewed "small beer" made from roots, bark and herbs. Charles Hires, a Philadelphia pharmacist, sold a root beer concentrate at the 1876 Centennial Exposition, and the drink became a soda-fountain staple.

Its signature was sassafras root bark. That is the note older drinkers still call "real" root beer, and it is the one you can no longer use.

Why sassafras oil is banned

Sassafras oil is about 80% safrole. Animal studies linked safrole to liver damage and cancer at high doses. Under an FDA order from December 1960, food with added safrole or sassafras oil is adulterated. So is sassafras bark used mainly to flavor something else, such as sassafras tea.¹

The legal route back is a safrole-free sassafras extract.² The rule requires the oily fraction to be thrown away during production. That oil is where most of the classic aroma lives, so the extract is a gentler note than the old oil was.

Expect this to come up when someone asks for "authentic" root beer. You cannot legally give them the original.

What you are tasting now

Sarsaparilla often gets named alongside it. The American drink sold as sarsaparilla was traditionally flavored with birch oil and sassafras, not the sarsaparilla vine. In practice the two profiles overlap heavily.

It is not a cola with other spices

Root beer is much less acidic. In one US study, most root beers measured between about pH 3.9 and 4.4. The major colas sat near 2.4.³ Less acid lets the vanilla and sweetness carry the drink, which is why root beer tastes smoother than a cola.

Two practical effects follow. First, sodium benzoate loses strength as pH rises past about 4, so check the preservative system instead of copying a cola's. Second, people expect a head of foam. Yucca and quillaja extracts are used to build one.

Most root beers are caffeine-free. Barq's is the best-known exception.

Building a root beer flavor

Dose the wintergreen with care. Methyl salicylate is very strong. A little reads as root beer. A little more reads as muscle rub.

Pick a style. Some root beers are sharp and wintergreen-led. Others are soft and vanilla-led. Match a reference product, because "root beer" alone does not tell a flavorist which one you mean.

It suits stevia better than most profiles. Stevia's licorice-like aftertaste can blend into the anise and licorice notes instead of sticking out. That makes root beer one of the easier zero-sugar briefs. See stevia aftertaste.

It survives heat. The core notes hold up well, which is why root beer barrels and other hard candy carry the flavor easily.

A natural version is straightforward. Natural wintergreen oil, vanilla extract and safrole-free sassafras extract all exist. Just do not expect the old sassafras-oil taste back.