Evidence check
How Much Caffeine Per Day for Weight Loss? What Trials Say
How much caffeine per day for weight loss has no proven answer. A 2019 meta-analysis of 13 trials and 606 people was very inconsistent and said caffeine "might promote" weight loss. Meanwhile FDA's reference for healthy adults is 400 mg a day, and EFSA says about 100 mg can affect sleep. SodaSlim has at least 138 mg per capsule.
Written by the SodaSlim label deskUpdated · 5 min read
The trials
Does caffeine help with weight loss?
Possibly a little, but the evidence is too inconsistent to name an amount. A 2019 meta-analysis pooled 13 randomized trials with 606 people, found very high inconsistency (I2 above 91%), and concluded only that caffeine "might promote" weight loss (Tabrizi 2019, caffeine and weight).
High inconsistency means the trials disagreed about size, and sometimes direction. The trials also used different doses, lengths and groups, so no single figure applies to a particular reader. No trial tested SodaSlim.
Metabolism and tolerance
What about caffeine and metabolism?
We found no source that gives a dependable figure for caffeine and metabolism in everyday users, so we make no claim about it.
People who drink caffeine daily usually build some tolerance, which is one reason a fixed dose can feel different over time. We found no trial in our source set that measured tolerance against weight, so treat that as an open question. What the sources do firmly give are limits, shown next.
| Source | Figure | Meaning |
|---|---|---|
| FDA | 400 mg a day | Reference for healthy adults |
| EFSA | 200 mg single dose | Adult single-dose figure |
| EFSA | About 100 mg | Can affect sleep in some people |
| ACOG | Under 200 mg a day | In pregnancy |
Side effects
What are the sleep and heart downsides of caffeine?
Poor sleep is the main one the sources name, and a faster heartbeat and jitters are common in sensitive people.
FDA warns that toxic effects can appear near 1,200 mg taken quickly (FDA, Spilling the Beans caffeine). Short sleep matters for weight too: in a review, partial sleep loss raised food intake by about 385 calories a day without changing energy use (Al Khatib 2017, sleep and energy balance). Caffeine that costs you sleep may work against itself.
The gauges below are an editor's reading of how well human studies support each label row's claim. They are not measurements, and not a rating of SodaSlim.
Green coffee bean extract
Little28 of 100
A handful of small trials, many with bias concerns, with mixed results. (Onakpoya 2011, green coffee review) (Asbaghi 2020, green coffee meta)
Raspberry ketone
Very little8 of 100
Mostly lab and animal work; very few human trials of the ingredient itself. (Morimoto 2005, raspberry ketone mice) (Lopez 2013, multi-ingredient raspberry ketone)
Garcinia extract
Little18 of 100
A few small human trials with mixed results; reports of liver injury exist. (Onakpoya 2011, garcinia meta) (van Breemen 2025, garcinia liver)
Caffeine
Mixed40 of 100
Well studied for alertness; evidence for body-weight outcomes is limited and mixed. (Tabrizi 2019, caffeine and weight) (FDA, Spilling the Beans caffeine)
Green tea extract
Little30 of 100
Trials on body weight are small and mixed; liver-injury reports exist at high catechin doses. (Jurgens 2012, Cochrane green tea) (LiverTox, green tea)
Our reading of the sources, not a measurement. Each needle is an editor's judgment of how well human studies support the label claim for that one ingredient, at studied amounts. It does not rate SodaSlim: no study tested the capsule or this five-row combination.
SodaSlim capsules: 30 to a bottleOne capsule a day · 2, 3 or 6 bottles · price and shipping shown at checkout
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Where does a SodaSlim capsule fall?
At least 138 mg, about 35% of FDA's 400 mg reference (138 / 400), before any coffee or tea.
The label says not for under 18, pregnant or nursing, and to consult a physician before use. Ask your doctor or pharmacist if you take medicine or have a heart condition, high blood pressure, anxiety or sleep trouble. Keep taking prescribed medicine. Chest pain, fainting or a racing heart that will not settle: call 911. For a balanced starting point, see healthy weight basics and the caffeine budget.
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FAQ
SodaSlim questions people ask
Is more caffeine better for weight loss?
No source shows that. The 2019 review of 13 trials was very inconsistent, and more caffeine also raises the chance of poor sleep and jitters.
Does coffee count as caffeine for weight?
Coffee caffeine counts toward your total like any other source. We found no trial that proves a coffee habit changes weight.
Can I take caffeine pills and drink coffee?
Count both. FDA's 400 mg a day reference includes supplements, and the SodaSlim capsule alone has at least 138 mg.
Who wrote this
Written and reviewed by
Pages built from the label, the seller's brief and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site of a USA Authorized SodaSlim Retailer. It is not the manufacturer, and the label names Gex Corporation LLP (Ogden, Utah) as the distributor. We earn money when you buy through our order links.
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