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Trials

Do Appetite Suppressant Pills Work? Capsaicin and Caffeine Trials

Appetite suppressant pills usually rely on capsaicin from cayenne, caffeine from guarana or tea, or fiber. A review of 20 capsaicinoid trials found about 50 kcal a day more energy use and less appetite in some trials, yet no magic bullet. Caffeine evidence is short and modest. No study of SodaBurn exists.

Written by the SodaBurn label deskUpdated · 4 min read

Three SodaBurn dropper bottles with gold and navy labels
A computer render from the brand of three bottles, not a photograph.

What is in them

What is in appetite suppressant pills?

They usually hold a stimulant such as caffeine, a pungent extract such as cayenne, or a fiber meant to add bulk. Many mix several.

Guarana seeds contain caffeine and are promoted for appetite and energy, though the evidence is weak (MSK, Guarana). Green tea adds catechins and caffeine, with a possible modest effect on weight in NIH's summary (NIH ODS, Weight loss supplements).

Our source list does not cover fiber trials, so we say nothing about them.

The numbers

What do trials of capsaicin and caffeine show?

They show small effects. Capsaicinoids raised energy use by about 50 kcal a day in a review of 20 trials with 563 people, and regular use lowered appetite in some of them (Whiting 2012, Capsaicinoids review).

For caffeine and guarana, NIH sees a possible modest effect, in short trials of mostly combination products (NIH ODS, Weight loss supplements).

IngredientTrial finding
CapsaicinoidsAbout 50 kcal a day more energy used
Caffeine, guaranaPossible modest effect, short trials
Green tea, outside JapanAbout 0.04 kg difference (Cochrane, Green tea for weight loss (2012))

Amounts

How do label amounts compare with trial amounts?

Often far apart. The bars below show the most each of four SodaBurn blend names could weigh, next to the amount a study or authority used.

  • Green tea leaf extract, at most (name 7)

    The ceiling is 0.65% of the reference amount
    Most this name could weigh in 1 ml of SodaBurn2.2 mg
    338 mg EGCG a day, a safe intake level for solid doses338 mg

    Both bars use one scale. The ceiling is arithmetic: the blend total (15.47 mg per 1 ml) divided by the name's place in the printed order. (Hu 2018, Green tea safety review)

  • Guarana seed extract, at most (name 4)

    The ceiling is 0.97% of the reference amount
    Most this name could weigh in 1 ml of SodaBurn3.9 mg
    400 mg of caffeine a day, the level FDA does not link to harm in most adults400 mg

    Both bars use one scale. The ceiling is arithmetic: the blend total (15.47 mg per 1 ml) divided by the name's place in the printed order. (FDA, How much caffeine is too much)

  • L-arginine, at most (name 16)

    The ceiling is 0.048% of the reference amount
    Most this name could weigh in 1 ml of SodaBurn0.97 mg
    2,000 mg a day, the low end of the 2 to 20 g range NIH describes2,000 mg

    Both bars use one scale. The ceiling is arithmetic: the blend total (15.47 mg per 1 ml) divided by the name's place in the printed order. (NIH ODS, Exercise and performance supplements)

  • L-carnitine HCl, at most (name 21)

    The ceiling is 0.025% of the reference amount
    Most this name could weigh in 1 ml of SodaBurn0.74 mg
    3,000 mg a day, where stomach effects are reported3,000 mg

    Both bars use one scale. The ceiling is arithmetic: the blend total (15.47 mg per 1 ml) divided by the name's place in the printed order. (NIH ODS, Carnitine)

Orange bars: the most the name could weigh if the printed order and total are exact. Teal bars: the reference amount from a study or authority. A reference amount says what was tested or advised, not what works for you, and no study tested SodaBurn.

SodaBurn: 2, 3 or 6 bottles1 fl oz (30 ml) a bottle · 1 dropperful a day · 60-day money-back guarantee

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On this label

Are SodaBurn drops an appetite pill?

No. SodaBurn is a liquid drop, and no study of it exists. Its label front says it "Helps Control Cravings & Appetite†".

Read the ingredients and side effects pages. Ask a doctor first if you take medicine or are pregnant or nursing. Adults 18 and older only.

SodaBurn: 2, 3 or 6 bottles1 fl oz (30 ml) a bottle · 1 dropperful a day · 60-day money-back guarantee

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FAQ

SodaBurn questions people ask

Do appetite suppressant pills work?

Slightly at most. Capsaicinoids lowered appetite in some trials, and caffeine shows a possible modest effect. Evidence is short and uneven, and no pill replaces eating and activity changes.

What ingredients are in appetite suppressant pills?

Common ones are caffeine, guarana, green tea extract, cayenne and fiber. Check the label for the amount of each, since some print only a blend total.

Are appetite suppressant pills safe?

It depends on the ingredients. Caffeine can cause jitters and poor sleep, and FDA warns of hidden drugs in some weight products. Ask a pharmacist first.

Can cayenne pills reduce hunger?

Capsaicinoids lowered appetite in some trials, but the authors called them no magic bullet. Cayenne can also cause sweating and stomach pain.

Who should not take appetite suppressant pills?

Ask a doctor first if you take medicine, have heart or blood pressure problems, or are pregnant or nursing. Under-18s should not use them.

Who wrote this

Written and reviewed by

Written byThe SodaBurn label deskIsodaburn, USA Authorized SodaBurn Retailer

Pages built from the label, the brand panels and linked NIH, FDA, CDC, FTC and peer-reviewed sources.

Medically reviewed byDr. Richard Kowalsky, MD, PhysicianRole: Medical reviewerReview date: October 31, 2026

Last updated . Read our editorial standards and how we check reviews. This website is the information site for a USA Authorized SodaBurn Retailer. It is not the manufacturer or a distributor named on the label. We earn money when you buy through our order links.

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SodaBurn liquid drops2, 3 or 6 bottles · 30 days a bottle · 60-day money-back guarantee

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