L-citrulline is an amino acid named after citrullus, the Latin word for watermelon, where it was first isolated. SodaSteel includes it as one of six named ingredients in a daily gummy centered on stamina, everyday energy and healthy muscle upkeep.
A name that comes from the produce aisle
Most ingredients in this series are roots, but L-citrulline is different. It is an amino acid, one of the small building-block molecules that proteins are assembled from, and it earned its name from watermelon, whose scientific name is Citrullus lanatus. In the 1930s, researchers in Japan isolated the compound from watermelon juice, and the name stuck.
The "L" in front simply describes the form of the molecule, a way chemists distinguish mirror-image versions. When you see L-citrulline on a label, it is the standard form used in supplements.
Where you can find it in food
Citrulline is found naturally in several everyday foods. Watermelon is the famous example, and the rind, the pale green-white part most people toss, contains more than the pink flesh. Other members of the gourd family carry it too.
- Watermelon, especially near the rind
- Cucumbers
- Cantaloupe and other melons
- Pumpkins and squash
- Bitter melon
Next time you slice a melon for a summer picnic, you are handling the original source. Supplement makers, though, usually produce L-citrulline through fermentation, which gives a consistent ingredient that does not depend on harvest seasons.
From melon patches to supplement shelves
Gourds have been cultivated for thousands of years. Watermelon is believed to have originated in northeastern Africa, with ancient Egyptian paintings showing what looks like the fruit and seeds turning up in old tombs. From there it spread across the Mediterranean and Asia, becoming a staple of hot-weather eating in many cultures.
The ingredient's trip into the wellness world is far more recent. Once it was identified and could be produced in a pure powder form, it became a regular part of daily formulas designed for adults who keep an active routine. Because it is an amino acid rather than a traditional herb, it has no centuries-old folk preparations attached to it. Its story is closer to nutrition science than to folklore.
A root such as ashwagandha is a whole plant part with hundreds of naturally occurring compounds, so two batches can vary with soil, weather and harvest timing. An amino acid is a single, well-defined substance. That is why a label can name it precisely, and why suppliers can describe exactly what they are delivering. For people who like clear, checkable ingredient lists, that precision is part of the appeal.
It also means this ingredient is easy to picture. You can hold a slice of watermelon in your hand and know that the story starts there, which is a refreshing contrast with a rainforest root you may never see in person.
Why formulas include it
Formula designers often pair botanicals with a few well-defined nutrients so the product reads as a complete idea rather than a pile of herbs. L-citrulline fits that role. It is easy to name, easy to source and widely recognized by people who read supplement labels. It is commonly included in daily wellness formulas aimed at active adults, which is one reason you will see it in the SodaSteel lineup next to roots such as Tongkat Ali and maca.
This guide deliberately avoids describing what it does inside the body. That question belongs to researchers, and the best way to explore it is to read primary sources yourself, for example by searching PubMed, the free index of biomedical literature run by the US National Library.
How it fits inside SodaSteel
SodaSteel combines L-citrulline with Tongkat Ali, ashwagandha, zinc, maca root and Tribulus terrestris in a chewable gummy. The brand directs adults to chew 2 gummies daily, preferably in the morning, and each bottle holds 60 gummies, which makes a 30-day routine. You will find the complete Supplement Facts panel printed on the bottle label.
If you would like a tour of the full lineup, the SodaSteel ingredients page lays it out. The mineral in the formula is covered in our zinc guide.
Small habits that pair well with a melon-friendly kitchen
Since the source of this ingredient is a fruit, here are a few ways to make everyday eating a bit more varied:
- Keep cut watermelon or cucumber in a container at eye level in the fridge.
- Add sliced cucumber to a water pitcher to make hydration more inviting.
- Pair fruit with a protein-rich breakfast, such as yogurt or eggs, so the morning feels balanced.
None of that replaces a formula, and a formula does not replace any of that. They simply coexist in a routine. If you decide SodaSteel suits yours, you can Order SodaSteel in the pack size you prefer; the brand backs it with a 60-day money-back guarantee counted from the original purchase date.
Further Reading
Frequently Asked Questions
The name comes from citrullus, the Latin word for watermelon, the fruit it was first isolated from.
Watermelon, cucumbers, melons, pumpkins and squash are known food sources.
Yes, it is one of the six named ingredients in the SodaSteel gummy.
The complete Supplement Facts panel is printed on the bottle label.