SodaSlim blog
Counting the Caffeine in Your Day
Caffeine is the one ingredient in a fat-burner you can do real arithmetic with. So do it.
Start here
The one ingredient you can plan around
Most of what a fat-burner label tells you cannot be planned around. A botanical extract at 130 mg has no dose to compare it against, no sensation to confirm it and, on several rows of this panel, no federal verdict stronger than the word small.
Caffeine is the exception, and a large one. The amount is printed in milligrams, the reference figures are published by federal agencies, and the arithmetic is addition. On this label the row reads caffeine anhydrous, 138 mg, and the green tea row adds up to about 3.9 mg more, because its standardisation prints “<3% caffeine” of 130 mg. So this post does the sum: three example days built only from figures MedlinePlus and FDA publish. The live version is the caffeine ledger on the home page, which this post does not rebuild.
The sources
The figures, and whose they are
Every drink figure in this post is MedlinePlus’s, quoted rather than rounded, and every ceiling is FDA’s. Nothing here is an estimate of ours.
The drinks, verbatim
MedlinePlus lists them as ranges, which is the honest way to list them: “An 8-ounce cup of coffee: 95-200 mg”; “An 8-ounce cup of tea: 14-60 mg”; “A 12-ounce can of cola: 35-45 mg”; and “An 8-ounce energy drink: 70-100 mg”. The width of the coffee range is the important part: more than a hundred milligrams of a day’s total can turn on the bean, the grind and the brew.
The ceiling, verbatim
FDA cites “400 milligrams a day — that’s about two to three 12-fluid-ounce cups of coffee — as an amount not generally associated with negative effects.” MedlinePlus puts it in its own words: “For most people, it is not harmful to consume up to 400mg of caffeine a day.” And FDA attaches a caveat that matters more than the number: “There is wide variation in both how sensitive people are to the effects of caffeine and how fast they eliminate it from the body.” So 400 mg is not a limit, a line or a dose. It is a reference point for healthy adults, published so people can locate themselves against it. Note also that MedlinePlus counts coffee in 8-ounce cups while FDA’s gloss describes 12-fluid-ounce ones; the totals below use the smaller cup.
The arithmetic
Three honest days, worked
| The day | What is in it | Total | Against 400 mg |
|---|---|---|---|
| A light dayCapsule, one coffee, one tea | 138 mg + 95–200 mg + 14–60 mg | 247–398 mg | Under the 400 mg figure across the range — but the top of it arrives within two milligrams of the line. |
| An ordinary dayCapsule, two coffees, one cola | 138 mg + 190–400 mg + 35–45 mg | 363–583 mg | Straddles it. A weak brew keeps the day under; a strong one puts it over by roughly half again. |
| A long dayCapsule, two coffees, one energy drink | 138 mg + 190–400 mg + 70–100 mg | 398–638 mg | Over the figure through almost the whole range, and the capsule is about a fifth of the total. |
Ranges are MedlinePlus’s and the totals inherit them. The 400 mg comparison figure is FDA’s. Add up to about 3.9 mg more to every row for the green tea extract.
The capsule is not the problem in any of those rows and it is not trivial in any of them either: it is a reliable, invisible 138 mg added before breakfast, and it is the one component of the day whose size you cannot adjust by making the coffee weaker. On the light day it is more than a third of the total; on the long day about a fifth.
Where these examples stop
They cover only what MedlinePlus lists, and it notes caffeine occurs naturally in more than sixty plants, so the undercount is systematic. If your own total lands near the figure FDA cites using only these four drinks, it is already higher than that.
The comparison
Against the research range
The dashed ghost is the amount the research ODS summarises actually uses — in its words, “up to 400‒500 milligrams (mg) a day”. The solid bar is what this capsule carries, and the gap cuts both ways. 138 mg is comfortably under a research amount and under the figure FDA cites, which is the fair thing to say first. But those studied amounts are what produced the result ODS describes, and ODS describes it as: caffeine “might help you lose a little weight or gain less weight over time”. A capsule at roughly a quarter to a third of the research amount is not positioned to produce more than that, and ODS adds that tolerance develops. Nobody needs to resolve that tension: the number you can act on is in the table above.
Timing
Why four to six hours matters
The listing card says “1 CAPSULE DAILY / SUGGESTED MORNING”. The bottle says only “take one (1) capsule daily”. The morning part is the seller’s advice rather than the label’s — and on this formula it happens to be good advice, because 138 mg of caffeine taken at four in the afternoon is a conversation with your sleep. MedlinePlus notes caffeine’s effects last “four to six hours”.
What that means in practice
A capsule taken at seven in the morning is largely behind you by early afternoon. The same capsule taken at three is still working at seven or eight in the evening. Same product, same amount, different day — and the variable is entirely under your control, which makes it the most useful single thing to know about this formula.
The mechanism
What caffeine does, and what a habit does
What it does
MedlinePlus: caffeine is “Caffeine is a bitter substance that occurs naturally in more than 60 plants”, and it “stimulates your central nervous system, which can make you feel more awake and give you a boost of energy”. That is the whole mechanism a label describes when it prints a phrase about energy, and it is why a capsule containing it will feel like it is doing something on the first morning.
What a daily habit does
MedlinePlus: caffeine “stimulates your central nervous system”, peaks within an hour and lasts “four to six hours”. Excessive use can cause “dependency, so you need to take more of it to get the same results”, and withdrawal brings headaches, drowsiness and irritability. It also lists who should check first: people who are pregnant or breastfeeding, and people with sleep disorders, migraines, anxiety, GERD, heart arrhythmias or high blood pressure.
One capsule a day for thirty days is a routine rather than an experiment, so a capsule that feels like something in week one may feel like nothing in week four while still counting the same 138 mg against your day. Stopping abruptly after a long run is the other half of that fact rather than a sign the capsule was working.
Before you start
Who should ask a provider first
Ask first if any of these applies
MedlinePlus names the groups who should check before taking caffeine: people who are pregnant or breastfeeding, and people with sleep disorders, migraines, anxiety, GERD, heart arrhythmias or high blood pressure. The bottle’s own caution panel is broader still: “Do not exceed recommended dose. Not for use by individuals under the age of 18 or pregnant or nursing mothers. Consult with a physician prior to use especially if you are taking a medication or have a medical condition.” And NCCIH adds the general instruction for this category: “If you’re considering a supplement marketed for weight loss, discuss it with your health care provider.”
That caution line is the strongest sentence on this wrap, and it is printed on the bottle rather than added by a marketer. FDA’s caveat is the reason to take it literally: “There is wide variation in both how sensitive people are to the effects of caffeine and how fast they eliminate it from the body.” The table above is an average day for an average adult, and nobody is one.
Closing
What to do with this
The rule
Caffeine is the one ingredient in a fat-burner you can actually do arithmetic with, so do it. Add the capsule to your coffees, your teas, your colas and anything labelled energy, and see where the day lands against 400 mg. If the total surprises you, that is the finding.
The honest version
A capsule at 138 mg is about a cup of coffee, which is neither alarming nor negligible. Whether it belongs in your day is a question about your day rather than about the capsule. The caffeine ledger on the home page does the addition for you, and the side effects page prints the caution panel in full. To the label’s credit it declares “Contains Caffeine” on its own line and prints the number in the panel, which is what made every sum in this post possible.
References
Sources
- U.S. Food and Drug Administration. Spilling the Beans: How Much Caffeine is Too Much?. www.fda.gov. Accessed September 24, 2026.
- MedlinePlus, U.S. National Library of Medicine. Caffeine. medlineplus.gov. Accessed September 24, 2026.
- Office of Dietary Supplements, National Institutes of Health. Dietary Supplements for Weight Loss: Fact Sheet for Consumers. ods.od.nih.gov. Accessed September 24, 2026.
Order SodaSlim from the official page
30 capsules a bottle, one capsule a day, so thirty days a bottle. Five ingredients with five published amounts and no proprietary blend, three of them carrying a printed standardisation — which is the reason every check on this site can be run at all. 138 mg of caffeine a capsule, so count it against your day. 60 days from purchase to change your mind. The order desk is +1 (302) 200-3480.
Price shown at checkout · 60-day window from the date of purchase · ships from inside the US · the label’s own support line is +1 (302) 200-3480
Next
Keep reading
The caffeine page, in full
138 mg a capsule set against the figure FDA cites, with the timing and the cautions.
Read it →The caution panel, printed in full
What the bottle warns about, and what MedlinePlus lists for caffeine at this kind of daily amount.
Read it →The whole label, line by line
Five rows, five amounts, three printed standardisations and the arithmetic they let you do.
Read it →