Meaty, savory, allium, roasted, truffle. These are the most potent compounds in flavor science. Detectable at parts per trillion. A family you need to understand even if you rarely use it directly.
Sulfur compounds are the heavyweights of flavor potency. They have the lowest detection thresholds of any compound family. Some, like 2-furfurylthiol (roasted coffee), are detectable at 0.01 parts per billion. That means a fraction of a drop in a swimming pool would still be perceptible. This extreme potency is why sulfur compounds are rarely used as primary flavoring tools. They work at trace levels, adding depth and complexity without being identifiable as their own note.
The personality is "savory." Not sweet, not bitter, not sour. Savory. Meaty. Cooked. That umami-adjacent quality that makes roasted garlic different from raw garlic, that makes a seared steak smell different from raw beef, that makes black truffle one of the most expensive foods on earth. All sulfur compounds.
For a bitters formula and botanical work, sulfur compounds are background players. You're not going to add dimethyl sulfide to a formula on purpose. But understanding them helps you recognize when an extract has a subtle "depth" or "savoriness" that you can't quite name. That's often trace sulfur compounds doing their work.
Sulfur compounds are the family you understand intellectually but rarely manipulate directly. In a bitters formula work, they show up as trace contributors to complexity. If you ever move into savory applications (garlic bitters, truffle-forward formulations, cocktails designed to pair with food), sulfur compounds become primary tools. For now, file this family as: "the reason some things taste deeper than they have any right to."
When the spider chart shows Sulfur Compounds elevated, the ingredient has a savory, meaty, or roasted depth that goes beyond what terpenes, phenols, or pyrazines provide alone. Use these ingredients sparingly. A little savory depth adds sophistication. Too much and the drink smells like cooked vegetables.
What you need: A clove of garlic, a knife.
The dramatic aroma change after crushing is sulfur compounds forming in real time. Crushing ruptures cells, allowing the enzyme alliinase to contact alliin and convert it into allicin and other sulfur compounds. The smell went from "nothing" to "garlic" because sulfur compounds were created by mechanical damage. This is the same principle as your ultrasonic homogenizer rupturing cells: breaking cells open releases and creates compounds that weren't accessible before.