Burntide Official Website › Guides
Independent Guides
Two long guides written by this desk that sell nothing: one on apple cider vinegar as an ingredient, from the trials to the doses they used, and one on how to choose a metabolism gummy, including the checks this product does not pass.
Reading for people deciding whether to buy anything in this category at all.
The two guides
The apple cider vinegar guide
What vinegar is, what the human trials actually measured, the doses they used, what a gummy can and cannot carry, and the dental question nobody raises until afterwards.
Around 1,900 words. Cites nine sources. Reaches a conclusion that favours a supermarket bottle over any gummy on dose alone.
How to choose a metabolism gummy
An eight-point checklist for any product in this category, then the same checklist applied to Burntide, scored honestly, including the three points it fails.
Around 1,900 words. Works as a checklist whatever you end up buying, or if you buy nothing.
Why a shop publishes these
Everything else on this website is written by a desk that earns when you buy. That is disclosed on the about page with a list of the places the site argues against its own interest, and these two guides are the strongest items on that list.
They are here because the most useful thing a commercial site can publish is the reading it would want you to have done before you arrived. If that reading leads you to a supermarket bottle of vinegar and a walk after dinner instead of a jar of gummies, the guide has done its job and this desk has lost a sale it was never going to keep.
They carry no order button
Neither guide has a call to action, a price or a pack comparison. The only product links in them are the ones a claim needs in order to be checkable.
They cite the same sources as the rest of the site
Every study is linked to its record. The reference list at the foot of each guide names each paper in full with its PubMed identifier.
They reach conclusions that cost something
The vinegar guide concludes that dose favours liquid. The checklist guide gives Burntide a score with three failures in it.
They are useful if you buy nothing
The checklist works on any product in this category. Take it to a competitor and the eight questions are the same.
What a guide has to do to be worth reading
A guide on a commercial website has one job, which is to be worth reading by somebody who is never going to buy anything. Four rules follow from that, and both guides here are written to them.
It has to answer the question it asks
Not circle it. The vinegar guide asks how much acetic acid the trials used and then puts the number in a table. A guide that raises a question and leaves it open has taken your time and given you an impression.
It has to be usable elsewhere
The eight-point checklist works on a competitor's label as readily as on this one. If a framework only produces the right answer about the product on the same website, it is not a framework.
It has to name its own limits
Both guides state where the evidence is thin, where a study was small, and where the honest answer is that nobody knows. That is more useful than confidence and it is a great deal rarer.
It has to survive being checked
Every citation links to its record. Open three at random. If any of them is not the paper the sentence describes, that is a reportable error and [email protected] wants to hear about it.
How these guides are sourced
Both guides are built from the same sources as the rest of this website, and the sourcing is worth stating because a long page with no visible method is just a long page.
| Source type | What it is used for | Examples in these guides |
|---|---|---|
| Human trials on PubMed | Anything about what an ingredient did to people | Ostman 2005, Stubbs 2017 |
| Systematic reviews and meta-analyses | Where a literature has to be summarised rather than cherry-picked | Launholt 2020, Arjmandfard 2025 |
| Government fact sheets | Requirements, intakes and neutral category guidance | the ODS weight-management sheet, the FDA supplement Q and A |
| The product label | Anything about this specific product | The Supplement Facts panel photographed on the jar |
| Nothing else | There is no fifth category | No manufacturer marketing copy is treated as a source |
The last row is the one that does the work. A sales page is not evidence about its own product, which is why the claim checks on this website compare listing artwork against the printed panel rather than repeating either.
Where else to read
The guides are the long-form end of this website. The pages below are the short-form end, and between them they cover most of what anybody asks.
| If you want | Read |
|---|---|
| The ingredient evidence in depth | The apple cider vinegar guide |
| A buying framework for the category | How to choose a metabolism gummy |
| What is in this specific product | The ingredients page |
| The label transcribed | The Supplement Facts panel |
| The five blog posts | The blog index |
| The manufacturer's own reading | The three companion guide volumes, described honestly |
A reading order that works
If you are reading this index before either guide, there is an order that works better than the obvious one.
Start with the checklist
The eight questions take about five minutes and they will tell you whether you want to be shopping in this category at all. Several readers will stop there, which is a legitimate outcome and the cheapest one.
Then the ingredient guide
The vinegar guide is the long answer to question two on that checklist, which is whether the amount on a label is anywhere near the amount in a study. It is the question everything else turns on.
Then the label, if you are still interested
The panel for this product, read with the checklist in hand. By that point you will know what you are looking at and what is missing from it.
That sequence takes about twenty-five minutes end to end and it is more than most people spend on a supplement decision. It is also the only way to arrive at a purchase, or at a decision not to buy, that you will still agree with in a month.
What these guides leave out
Both guides deliberately leave things out, and a reader is better served by knowing what than by discovering it halfway down.
- ✓No dosing recommendation. Neither guide tells you how much of anything to take. That is a clinician's job and a label's job, and a website that does it is overstepping.
- ✓No comparison table of competing brands. Comparisons written by a seller are worth nothing. The checklist is given to you instead, so you can build your own.
- ✓No promise about outcomes. Neither guide states what will happen to anybody, because nobody knows and the evidence does not support a forecast.
- ✓No coverage of prescription treatments. Where a reader's real question is about a medicine rather than a supplement, both guides point at a clinician and stop.
The omissions are the reason the guides can be read quickly. A page that tries to cover everything ends up asserting more than it can support, and in this category that is how a guide turns into an advertisement without anybody deciding that it should.
References behind this Burntide page
Every source below was opened and checked. None of them studied Burntide itself; they concern the ingredients, at the amounts the researchers used.
- Arjmandfard D, Behzadi M, Sohrabi Z, et al. Effects of apple cider vinegar on glycemic control and insulin sensitivity in patients with type 2 diabetes: a GRADE-assessed systematic review and dose-response meta-analysis of controlled clinical trials. Front Nutr. 2025;12:1528383. PMID 39949546. https://pubmed.ncbi.nlm.nih.gov/39949546/
- Launholt TL, Kristiansen CB, Hjorth P. Safety and side effects of apple vinegar intake and its effect on metabolic parameters and body weight: a systematic review. Eur J Nutr. 2020;59(6):2273-2289. PMID 32170375. https://pubmed.ncbi.nlm.nih.gov/32170375/
- Stubbs BJ, Cox PJ, Evans RD, et al. On the metabolism of exogenous ketones in humans. Front Physiol. 2017;8:848. PMID 29163194. https://pubmed.ncbi.nlm.nih.gov/29163194/
- Evans M, McClure TS, Koutnik AP, Egan B. Exogenous ketone supplements in athletic contexts: past, present, and future. Sports Med. 2022;52(Suppl 1):25-67. PMID 36214993. https://pubmed.ncbi.nlm.nih.gov/36214993/
- National Institutes of Health, Office of Dietary Supplements. Dietary Supplements for Weight Loss: Fact Sheet for Health Professionals. https://ods.od.nih.gov/factsheets/WeightLoss-HealthProfessional/
- National Institutes of Health, Office of Dietary Supplements. Dietary Supplements: What You Need to Know. https://ods.od.nih.gov/factsheets/WYNTK-Consumer/
- U.S. Food and Drug Administration. Questions and Answers on Dietary Supplements. https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements
- U.S. National Library of Medicine, MedlinePlus. Dietary Supplements. https://medlineplus.gov/dietarysupplements.html
Every page, every journal post, the bottle facts and the ingredients go through review by Dr. Spencer Berry, MD before they ship. We write these pages from the Burntide label, the Supplement Facts panel photographed on the jar, and the distributor’s own paperwork. We cite public research for apple cider vinegar and beta-hydroxybutyrate, and we print “not published” wherever the label withholds a figure rather than estimating it. Where the manufacturer’s own listing artwork claims more than the panel supports, we say so on the page. Corrections are made on the page itself and the review date moves forward. Write to [email protected]. Last reviewed September 2026 by Dr. Spencer Berry, MD.