One printed number

Five Milligrams Of Caffeine, And Why A Label Bothers To Print It

Caffeine is the only ingredient in Horse Boost with an amount beside its name. Five milligrams is about a twentieth of a mug of coffee, which raises an obvious question: why declare it at all? The answer explains more about supplement labelling than the figure itself does.

By Horse Boost Team · Last updated September 19, 2026 · 8 min read · One printed number · Reviewed by Dr. Ashley Tapscott, MD

Why one number is broken out of a blend

A proprietary blend is allowed to hide its split. 21 CFR 101.36 requires the total weight of the blend and the names inside it in descending order of predominance, and nothing more. So a manufacturer who breaks one figure out is either required to, or choosing to.

In this case it is almost certainly the former in spirit and the latter in form. Caffeine is a pharmacologically active stimulant that consumers actively track, and declaring it separately is the responsible convention in this category whether or not a specific rule compels it on a given label. A product that put an unstated quantity of caffeine inside an unsplit blend would be a product to avoid.

The result is that this panel has exactly two numbers a reader can use: 82 mg for the blend, and 5 mg for caffeine. One of those is a ceiling for nine ingredients and the other is an actual amount. It is worth noticing which is which.

How much five milligrams is

Very little, and the comparison is the fastest way to see it.

Beverage figures are the ordinary published ranges and vary widely with preparation. The last row is the threshold identified in the meta-analysis cited below and is the only figure here taken from a single source.

Forty times less than the dose where a meta-analysis of thirty-one trials in 1,455 people found reaction time and accuracy separating clearly from placebo. Nineteen times less than a mug of coffee. About a third of a cup of decaf.

On sleep, the systematic review of caffeine and sleep concerns doses and timings that are not in the same conversation as 5 mg. MedlinePlus is the plain-language reference if you want the general picture.

So the honest statement about this figure is that nothing in the published literature predicts an effect from it. That is not a criticism of the label. It is a reason the label is worth trusting on other things: a manufacturer who declares a figure this small is not declaring it to impress anyone.

Where it probably comes from

Green tea extract is the fourth name on the blend and green tea naturally contains caffeine. An extract concentrates it along with the catechins, so any product carrying green tea extract carries some caffeine unless it has been specifically decaffeinated.

That is the most likely explanation for a 5 mg figure on a panel with no other stimulant on it, and it matters for one practical reason: the 5 mg is the total the label declares for the gummy. It is not an addition to whatever the tea extract carries, it is that amount.

The related point is about catechins rather than caffeine. The systematic review of green tea safety sets a safe intake of 338 mg of EGCG a day for a solid bolus dose and identifies the liver as the target organ above it. An 82 mg blend shared nine ways is nowhere near that figure. Anyone taking a separate green tea extract alongside it should nevertheless add the two together rather than counting them apart.

• Green tea extract is on the panel, fourth of nine.
• Green tea contains caffeine; an extract concentrates it.
• 5 mg is the declared total, not an addition to it.
• The catechin question is separate and is about the liver, not about alertness.
• Two green tea products at once is the one combination worth adding up.

Whether the time of day matters at 5 mg

The label prints no time of day. That is unusual enough to be worth explaining, because a product carrying any stimulant at all will often specify a morning dose.

Caffeine's half-life in a healthy adult runs to about five hours, which is why an afternoon coffee reaches bedtime with a meaningful fraction of it still circulating. Run the same arithmetic on 5 mg and the numbers stop being interesting: after five hours there is 2.5 mg, after ten there is 1.25 mg, and a single square of dark chocolate would have contributed more.

So the honest advice about timing is that it is a habit question rather than a pharmacological one. Take it whenever you will reliably remember it, which for most people is attached to something already fixed in the morning. The only reason to prefer the morning specifically is that it removes the question entirely for anyone who believes themselves unusually sensitive, and removing a question costs nothing.

1. No time of day is printed on this label.
2. Five milligrams is too small for the usual timing arithmetic to bite.
3. Pick the moment you will not forget, not the pharmacologically optimal one.
4. If you think you are caffeine-sensitive, take it in the morning and stop thinking about it.
5. Thirty days in a row matters far more than which thirty moments they were.

Who should actually care

Four groups for whom the figure is worth reading, and one for whom it is not.

The fourth row is the one worth pausing on. A reader avoiding caffeine completely, for whatever reason, is entitled to treat 5 mg as disqualifying, and the label gives them what they need to make that call in about two seconds. That is exactly what a declared figure is for.

The fifth row is the honest one for most people. A twentieth of a cup of coffee, taken once a day, is not a thing to plan around.

The wider habit this teaches

On any supplement label in any aisle, find the numbers that are actually numbers. Vitamins and minerals must be declared individually. Stimulants are conventionally declared. Everything else in a blend shares one figure.

Those declared amounts are the only part of a label that can be compared with anything, which makes them worth disproportionate attention even when they are small. A panel with one real figure on it tells you more than a panel with a longer list of names and none.

1. Find every amount printed beside a single name.
2. Find the blend total and the count of names sharing it.
3. Ask whether the declared amounts are large enough to matter.
4. Ask whether the undeclared ones could be, given the ceiling.
5. Buy on the answers, not on the length of the list.

There is a version of this habit that goes wrong, and it is worth naming. A buyer who learns to look for declared amounts can end up preferring the label with the most numbers on it, which is not the same as the label with the best numbers on it. A product listing fourteen vitamins at token percentages has more figures than this one and tells you less, because a long column of two-per-cent entries is a decoration made of arithmetic.

The useful question is not how many amounts are printed. It is whether any printed amount is large enough to do something, and whether the undeclared remainder could be. On this panel the answer to the first is no, at 5 mg of caffeine, and the answer to the second is capped at 77 mg across eight names. Both of those are worth knowing and neither depends on counting how many figures the label carries.

The same reading applies to the parts of this label that carry no figure at all. The Other Ingredients line names corn syrup and cane sugar first, which is a statement about weight without a number attached, and the nutrition block above the blend turns that statement into three grams. A label read in order tells a consistent story; a label read for its largest numbers tells whichever story the packaging wanted.

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