DigestFlow Ingredients: What Each Capsule Contains

Standardised to 50% chlorogenic acids, so a 130 mg row delivers roughly 65 mg of acids. Green coffee is unroasted coffee: roasting is what destroys most of the chlorogenic acid content, which is why the extract exists at all.

What happens to those acids is the interesting part for a gut product. The metabolism review by Clifford and colleagues describes chlorogenic acids as poorly absorbed intact, with the bulk reaching the colon and being transformed there by resident bacteria. Whatever the effect is, it happens in the lower gut rather than in the bloodstream.

The reputation of this ingredient rests largely on one trial, and that trial was retracted. The 2012 crossover study is catalogued by PubMed as a Retracted Publication. It is still quoted widely; it should not be. Separately, a 2026 quantitative analysis of green coffee supplements on sale found chlorogenic acid and caffeine contents that repeatedly failed to match the declared figures, which is a reason to prefer a label that prints a standardisation percentage, as this one does.

A single aromatic compound, the one that gives raspberries their smell. It is not an extract and there is no standardisation figure to read, so 130 mg is 130 mg.

The evidence base is honest and short. The 2005 rodent study that started the interest fed raspberry ketone to mice at doses far above anything a capsule delivers and reported effects on fat accumulation. A 2021 pharmacological review surveyed the field afterwards and the picture had not changed much: cell and animal work, no controlled human trial of the isolated compound.

There is also nothing in that literature about digestion in either species. This row is on the panel because it is a standard member of the ingredient set, and a reader is better served by hearing that than by a paragraph of mechanism written around a gap.

Standardised to 50% hydroxycitric acid, so roughly 65 mg of HCA from this row. The fruit rind is the traditional source and HCA is the compound everything is written about.

The reference trial is Heymsfield and colleagues in JAMA, which ran 1,500 mg of HCA a day for twelve weeks in a randomised, placebo-controlled design and found no difference between the arms. That is roughly twenty-three times this row's HCA content, and it did not separate from placebo.

The reason this ingredient still deserves a careful paragraph is safety rather than efficacy. Published case reports describe liver injury associated with garcinia products, including acute liver failure, failure requiring transplantation and a 2019 case report; the LiverTox monograph collects them. Most involve multi-ingredient products at higher doses than this. Anyone with existing liver disease should know the reports exist before taking any product containing it.

The largest row on the panel, dried caffeine in powder form, and the only ingredient here with a documented effect on the organ this product is sold for.

Rao and colleagues measured colonic motor activity directly and found coffee raising it within four minutes, with the effect persisting for at least half an hour. A 2025 systematic review pulled together the adult constipation evidence, and the CaCo randomised trial tested caffeine specifically for restoring bowel function after laparoscopic colectomy. That is a genuine, narrow, checkable mechanism and it belongs at the front of any honest account of this formula.

138 mg is roughly a large mug of coffee. The FDA puts 400 mg a day as the level not generally associated with negative effects in healthy adults, and the 2017 systematic safety review is the work behind that figure. One capsule is about a third of the day's allowance before you drink anything.

The most heavily standardised row on the panel: 98% polyphenols, 75% catechins, 45% EGCG and under 3% caffeine. At 45%, this row carries about 59 mg of EGCG, and the sub-3% caffeine line means it adds only a few milligrams on top of the 138.

Green tea extract has been studied mostly for energy expenditure rather than digestion, usually in combination with caffeine. A 24-hour chamber study tested exactly that pairing, and the Cochrane review on green tea preparations concluded the effects were small and not clinically important. NCCIH summarises the position for a general reader.

The safety note is worth stating precisely rather than vaguely. The USP hepatotoxicity review examined the case literature and located the concern in concentrated extracts taken in large daily amounts, above roughly 800 mg of EGCG, often on an empty stomach. LiverTox takes the same line. 59 mg is a long way below that, and the reason to know the figure is that green tea extract turns up in several products at once.