Amino acidL-Lysine HCL
An essential amino acid, as the hydrochloride salt
- One of the nine essential amino acids, sold here as the hydrochloride salt, which is the usual supplement form.
- You already get it from any diet with protein in it: meat, fish, dairy, eggs, beans.
- Its best-known supplement use is cold sores, where the evidence is mixed. It is also studied in some calcium-absorption work.
- It is first on the blend list, so by label rules it is the largest share of the 1,000 mg.
- Nothing about lysine is a digestive mechanism, and nothing we can find studies it for gut balance.
Watch for: Generally well tolerated. High doses can cause stomach upset and diarrhoea. Source: NIH Office of Dietary Supplements, “Dietary Supplements for Exercise and Athletic Performance (amino acids)”.
Food ingredientApple cider vinegar
Malus domestica, fruit
- Fermented apple juice, dried into a powder for capsules.
- It is the closest thing on this label to a traditional digestive ingredient, which is why it is worth taking seriously.
- The actual research is mostly on blood sugar after meals and on appetite, in small studies with mixed results.
- NCCIH’s summary is that there is little solid evidence for the health claims made about it.
- A capsule of dried vinegar is also not the same product as a spoonful of liquid vinegar, and studies generally used the liquid.
Watch for: In liquid form it can erode tooth enamel and worsen reflux. In a capsule those concerns are smaller, but stomach upset is still possible. Source: National Center for Complementary and Integrative Health, “Apple Cider Vinegar”.
HerbGarcinia cambogia powder
Garcinia gummi-gutta, fruit rind
- Fruit rind of Garcinia gummi-gutta, also called Malabar tamarind.
- Its active compound is hydroxycitric acid, or HCA. The label does not say how much HCA is standardised to, or whether it is standardised at all.
- It is a weight-loss ingredient, not a digestive one, and it has been sold that way for two decades.
- Reviews find the effect on body weight small at best, and generally not clinically meaningful.
- It is the ingredient here with the most serious safety literature attached to it.
Watch for: Rare reports have linked garcinia-containing products to liver injury, including a small number of serious cases. Stop and see a doctor if you notice yellow skin or eyes, dark urine or unusual tiredness. Source: National Center for Complementary and Integrative Health, “Garcinia Cambogia”.
HerbTongkat ali extract
Eurycoma longifolia, root
- Root of Eurycoma longifolia, from Southeast Asia, also called longjack.
- Small trials have looked at male hormones, stress markers and exercise performance, with mixed results.
- Studies typically use 200–400 mg a day of a standardised extract.
- It is a men’s-vitality herb. Nothing here connects it to digestion.
- Product quality varies widely, and some imported material has been found contaminated with heavy metals.
Watch for: Limited safety data. Ask a doctor if you take medication; quality varies between suppliers. Source: NIH Office of Dietary Supplements, “Dietary Supplements for Exercise and Athletic Performance”.
HerbHorny goat weed extract
Epimedium grandiflorum, plant
- Leaf and aerial parts of Epimedium grandiflorum, used in traditional Chinese medicine.
- Its best-known compound is icariin. This label does not state how much icariin, or any standardisation at all.
- Human evidence for sexual function, energy or anything else is limited.
- Like tongkat ali, it belongs to the men’s-vitality family rather than to digestion.
- Memorial Sloan Kettering’s monograph is the most useful plain-language summary of what is known.
Watch for: Dizziness, dry mouth and rapid heartbeat have been reported. MSK advises avoiding it with heart disease. Source: Memorial Sloan Kettering Cancer Center, “Epimedium / Horny Goat Weed (About Herbs)”.
HerbWild yam extract
Dioscorea villosa, root
- Root of Dioscorea villosa.
- It is sold on the idea that its diosgenin becomes hormones in the body.
- That conversion happens in a laboratory, not in people, which NCCIH states plainly.
- Traditionally it was used for cramps and colic, which is the only loose digestive link on this list.
- No amount is published, and no standardisation is stated.
Watch for: Large amounts can upset the stomach. It is not a hormone, whatever the marketing around it says. Source: National Center for Complementary and Integrative Health, “Wild Yam: Usefulness and Safety”.
Herb · not in the adsCinnamon extract
Cinnamomum verum, bark
- Bark of Cinnamomum verum, the “true” or Ceylon cinnamon, as printed on the panel.
- This is one of the three ingredients the seller’s images leave out entirely.
- It is studied mainly for blood sugar, with small and inconsistent results across trials.
- Ceylon cinnamon is lower in coumarin than the cassia type, which matters at high intakes.
- It is a kitchen spice with a long digestive folklore and thin modern evidence for it.
Watch for: May lower blood sugar, which matters alongside diabetes medicine. Cassia cinnamon carries a coumarin liver concern at high intakes; the panel names the Ceylon species. Source: National Center for Complementary and Integrative Health, “Cinnamon: Usefulness and Safety”.
Herb · not in the adsBitter melon extract
Momordica charantia, fruit
- Fruit of Momordica charantia, a vegetable across South Asia and East Asia.
- The second of the three ingredients missing from the seller’s images.
- It is studied for blood sugar, where NCCIH describes the evidence as limited and inconsistent.
- It is genuinely bitter, and bitters have a traditional appetite and digestion role, which is the nearest thing to a rationale here.
- No amount and no standardisation are published.
Watch for: Can lower blood sugar, which is a real interaction with diabetes medicine. Stomach upset and diarrhoea are the common complaints. Not advised in pregnancy. Source: National Center for Complementary and Integrative Health, “Bitter Melon”.
Compound · not in the adsRaspberry ketones
A flavour compound found in raspberries
- The aroma compound that gives raspberries their smell, made synthetically at supplement scale.
- The third ingredient missing from the seller’s images, and last on the blend list, so the smallest share.
- It became popular as a weight-loss ingredient after television promotion, not after trials.
- Human evidence is very limited; most of what exists is cell and animal work.
- There is no digestive rationale for it at all that we could find.
Watch for: Little human safety data at supplement doses. No reviewed summary supports its weight-loss use. Source: NIH Office of Dietary Supplements, “Dietary Supplements for Weight Loss”.
