Glutamine half-life
Glutamine is an amino acid, and the most abundant free one in your blood. A supplemental dose is absorbed and cleared quickly, with a plasma half-life of about 1 to 2 hours, so it leaves the blood within a day and does not build up across doses. Because the body already makes and turns over tens of grams daily and holds a large reserve in muscle, blood levels are set mostly by internal supply, which is why glutamine is taken daily rather than accumulating in tissue over time.
What a half-life actually means
A half-life is the time it takes for half of what is in your blood to be gone. It does not mean the compound is finished at that point. Half goes, then half of what is left goes, and so on.
That is why the last traces take so much longer to disappear than the first. Most references treat something as effectively cleared after about five half-lives, which for Glutamine is roughly 7.5 hours.
How Glutamine clears
| Half-lives | Time since dose | Roughly left |
|---|---|---|
| 1 | 1.5 hours | 50% |
| 2 | 3 hours | 25% |
| 3 | 4.5 hours | 12.5% |
| 4 | 6 hours | 6.25% |
| 5 | 7.5 hours | 3.125% |
These are round numbers from a single half-life figure. Real clearance shifts with dose, body composition, liver and kidney function, and what else you are taking. Treat it as a shape, not a schedule.
Why the timing matters
A short half-life means levels swing between doses, so timing and frequency do most of the work. A long half-life means levels build for days or weeks before they settle, so a change you make today might not show up for a while, and stopping does not clear things straight away.
Glutamine sits at about 1.5 hours, so it behaves like the short end of that range.
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