Let's Talk Cinnamon

Cassia vs. True Cinnamon: Taste, Health Benefits, and How to Use Each One

Few spices carry as much warmth, history, and everyday magic as cinnamon. It's in your coffee, your holiday baking, your favorite curry, and probably your spice rack right now. But here's a secret most home cooks don't know: the "cinnamon" on most grocery store shelves isn't actually true cinnamon at all. It's cassia — a close, flavorful cousin with a very different profile.

At Sullivan Street Tea & Spice Company, we carry both cassia and true (Ceylon) cinnamon in whole stick and powder form, sourced from Indonesia, Vietnam, and Sri Lanka. In this guide, we're breaking down what actually separates these two spices — in flavor, in health benefits, and in the kitchen — so you can choose the right cinnamon for the right job.

What's the Difference Between Cassia and True Cinnamon?

Both cassia and Ceylon cinnamon come from the inner bark of trees in the Cinnamomum genus, but they are different species grown in different regions:

• Cassia cinnamon (Cinnamomum cassia and related species like Cinnamomum loureiroi) is grown primarily in Indonesia, China, and Vietnam. It's the type you'll find in most supermarket spice jars and in almost all mass-produced baked goods.
• Ceylon cinnamon — often called "true cinnamon" — comes from Cinnamomum verum, native to Sri Lanka (formerly known as Ceylon).

The two are easy to tell apart once you know what to look for. Cassia bark is thick, hard, and curls into a single rolled layer with a darker, reddish-brown hue. Ceylon cinnamon bark is thinner, lighter in color, and curls into multiple delicate layers — often compared to a cigar or a scroll of tissue-thin paper.

Taste: Bold and Spicy vs. Sweet and Subtle

If you've only ever had cassia cinnamon, true cinnamon can come as a surprise. Cassia is what most of us grew up on — it's punchy, warm, and a little sharp, with a flavor that stands up to strong spices and heavy sweetness. That's exactly why it works so well in cassia cinnamon sticks steeped into chai, mulled cider, or a rich curry — its intensity doesn't get lost.

Ceylon cinnamon, on the other hand, is softer and more nuanced. Sullivan Street describes it as slightly sweeter and more subtle than its cassia cousin — a delicate flavor that makes it a lovely addition to more complex spice blends without overpowering them. Some tasters pick up light citrus or clove-like undertones. It's the cinnamon of choice for pastry chefs who want the aroma of cinnamon without the bite.

Health Benefits: What the Research Actually Says

Cinnamon has been studied for decades, and much of that research points to real, measurable effects — with one important caveat about dosage and cinnamon type.

Blood Sugar and Insulin Function

The U.S. Department of Agriculture's Beltsville Human Nutrition Research Center has run some of the most cited cinnamon research in existence. Their findings show that extracts of cinnamon increase insulin activity several-fold, and improved insulin function leads to improved blood sugar concentrations. In a human study of people with type 2 diabetes, USDA researchers found mean improvements in blood glucose ranging from 18 to 29%, along with reductions in triglycerides, LDL-cholesterol, and total cholesterol. Notably, the active compounds are water-soluble and not destroyed by heat, so cinnamon tea, oatmeal, or coffee all count.

Healthline's review of the research agrees, noting that cinnamon may lower fasting blood sugar levels and improve hemoglobin A1c, generally at doses of about half a teaspoon or less per day.

Heart and Anti-Inflammatory Benefits

Harvard Health notes that cinnamon is one of the best-studied spices, and that much of that research has focused on cinnamon's ability to help regulate blood sugar, since scientists believe it helps cells use glucose more effectively, which is especially important for people with diabetes. Harvard also points out that spices in general need to be used liberally, not just a dash here and there, to maximize their benefits — one nutrition expert suggests a teaspoon or two a day to get a therapeutic effect.

Healthline adds that people who supplement with at least three-quarters of a teaspoon of cinnamon a day may see lower triglycerides, total cholesterol, LDL cholesterol, and blood sugar, and that consistent use for three months or more may help reduce blood pressure.

Antioxidants and Beyond

Cinnamon is also rich in polyphenol antioxidants, and Healthline reports that supplementation may increase total antioxidant capacity, helping counter oxidative stress linked to a range of chronic conditions. Early research also points to anti-inflammatory, anti-viral, and even potential neuroprotective properties, though researchers caution that much of this evidence still comes from lab and animal studies rather than large human trials.

Cassia vs. Ceylon: The Coumarin Factor

Here's the most important health distinction between the two cinnamons. Cassia cinnamon naturally contains higher levels of a compound called coumarin, which may lead to side effects like liver damage in high doses. Ceylon cinnamon, by contrast, has a far lower coumarin content, making it a safer choice for daily supplementation at higher doses. For occasional culinary use, cassia is perfectly fine for most people — but if you're sprinkling cinnamon on your oatmeal every single morning, Ceylon is the smarter long-term choice.

Compared to Ceylon cinnamon, Cassia cinnamon is generally more affordable and more widely available — which is exactly why it dominates supermarket shelves, even though Ceylon is considered the "true" and gentler variety.

Culinary Uses: Choosing the Right Cinnamon for the Job

Once you understand the flavor and chemistry differences, choosing between cassia and Ceylon becomes intuitive:

• Use cassia for bold, spice-forward dishes: chai tea, mulled wine, curries, gingerbread, cinnamon rolls, and anywhere you want cinnamon to be the star.
• Use Ceylon for delicate applications: custards, rice pudding, fruit compotes, Middle Eastern and Asian dishes like biryani, stews, and meat marinades, or simply for daily sprinkling where you want warmth without sharpness.
• Sticks vs. powder: Whole cinnamon sticks are ideal for steeping — teas, mulled drinks, poaching liquids — and they hold their flavor almost indefinitely. Ground cinnamon is better for baking, spice rubs, and anywhere you need the flavor evenly distributed.

Shop Sullivan Street's Organic Cinnamon Collection

All of our cinnamon is organic and sourced directly from growers we know and trust. Here's the full lineup:

Cinnamon Powder – Vietnamese

Grown in the highlands of Northern & Central Vietnam from the Cinnamomum loureiroi tree, this fluffy organic powder has an especially high oil content (around 4%), giving it a rich, aromatic, pleasantly sweet flavor. Widely considered among the best cassia-type cinnamons available.

From $8.00

Shop Vietnamese Cinnamon Powder

Cinnamon Powder – Ceylon

Organic true cinnamon from Sri Lanka. Slightly sweeter and more subtle than cassia, this delicate powder is perfect for baking or blending into more complex spice mixes without overwhelming other flavors.

From $9.00

Shop Ceylon Cinnamon Powder

Cinnamon Sticks – Cassia

Sourced from Indonesia, these organic cassia sticks have a darker, red-brown hue and a thick, rugged single-layer bark. Strong and potent, they're a favorite for curries, chai infusions, and mulling spices.

From $9.00

Shop Cassia Cinnamon Sticks

Ceylon Cinnamon Sticks (True Cinnamon)

Organic true cinnamon sticks from Sri Lanka, lighter in color and sweeter than cassia sticks. Easy to grind, with an almost indefinite shelf life, they're wonderful in curries, stews, biryanis, and as a marinade for beef and lamb.

From $16.00

Shop True Cinnamon Sticks

Sweet Cinnamon Spice Black Tea

Organic and fair-trade Indian and Sri Lankan black teas blended with organic cinnamon, cloves, orange peel, and orange extract. A lively, spicy cup balanced with bright citrus — cinnamon's warmth in an everyday teacup.

From $12.00

Shop Sweet Cinnamon Spice Tea

This article is for informational purposes only and is not a substitute for professional medical advice. If you have a health condition or are considering cinnamon supplementation for therapeutic purposes, please consult your doctor — particularly around coumarin intake from cassia cinnamon.