💧 L-citrulline: how much is actually used in research?

Research on L-citrulline and blood flow generally uses 3,000 to 6,000 mg per day. 💧 Soda Horse Peak lists 35 mg. Both facts are published, and this page is about what that gap means.

🔬 Why citrulline is a good ingredient

Credit first. L-citrulline is a sensible choice and the brand picked it over L-arginine for a good reason.

Taking arginine directly is inefficient — much of it is broken down in the gut and liver before reaching circulation. Citrulline bypasses that route and converts to arginine afterwards, raising blood arginine more reliably than arginine itself does. That is why newer research favours it. The MedlinePlus entry covers both.

📏 The amounts used in studies

Trials looking at citrulline and vascular outcomes typically use gram quantities — commonly in the 3 to 6 gram range per day, sometimes as citrulline malate at higher figures for exercise work. Measured over weeks.

That is the body of research the ingredient's reputation rests on. It is the reason any label is allowed to say "one of the most researched amino acids" and be telling the truth.

🧮 So what does 35 mg mean?

It means roughly one per cent of the lower end of that range.

We are not saying 35 mg does nothing — nobody has tested it, and we will not invent a finding in either direction. We are saying that the research which makes citrulline worth naming was not done at anything close to this amount, so it cannot be used to predict what this amount does.

That distinction is the single most useful thing a supplement page can teach you, and it applies to every product on the shelf, not just this one.

🍬 Why gummies end up here

Worth understanding rather than just criticising. A gummy holds far less material than a capsule. Three grams of citrulline in a gummy would be a large, unpleasant object, and you would need several a day.

So the trade is structural: gummies buy adherence and lose capacity. Whether that trade is worth it depends on whether you would actually take the capsule. For plenty of people, a small amount taken daily beats a large amount abandoned. We go into that trade-off here.

✅ How to read any label that names citrulline

• Look for the amount, in milligrams or grams. If it is not published, you have learned nothing.
• Compare against the gram range above, not against other supplements' marketing.
• Check whether it is citrulline or citrulline malate — malate figures include the malic acid, so the citrulline portion is smaller.
• Remember that a correct ingredient at a token amount is still a token amount.

📝 Fair to the product

Soda Horse Peak publishes its figure. Most of its competitors hide theirs inside a proprietary blend precisely so this page cannot be written about them. That is worth something, even when the number itself is small. Full label breakdown here.