Every ingredient on the label
Three named actives, one excipient, and not a single published amount. Rather than describing all three in the same glowing adjectives, we grade each against the research that exists — and put the safety information before the benefits.
Valiora names three active ingredients: Green Tea Extract (Camellia sinensis leaf), Apple Cider Vinegar and Berberine HCl, held in a proprietary blend. Magnesium stearate is listed separately as a manufacturing excipient rather than an active. No individual amounts are disclosed anywhere — not on the website, not in the FAQ, and the supplement facts panel is referenced but never shown. The serving is one capsule daily from a 30-capsule bottle.
Before anything else: berberine works the opposite way to most herbal interactions, and it is contraindicated in pregnancy. Most people assume a botanical either does nothing or weakens a medicine. Berberine inhibits CYP3A4, CYP2D6 and CYP2C9, which means it can raise blood levels of drugs your prescriber has carefully titrated — statins, cyclosporine and many others. It also lowers blood glucose on its own, so stacked onto metformin, insulin or a sulfonylurea it can contribute to hypoglycaemia. And because it displaces bilirubin from albumin, it is contraindicated in pregnancy, breastfeeding and newborns, where the documented concern is kernicterus. If you take any regular medication, or are pregnant or nursing, speak to a pharmacist before ordering.
Interactions first, benefits second
Most ingredient pages lead with what each component might do for you and bury the cautions at the bottom. We are inverting that, because for this formula the safety information is more likely to change your decision than the benefit information — and because berberine works in a direction most people do not expect.
| Ingredient | Interacts with | Why it matters |
|---|---|---|
| Berberine | Pregnancy, breastfeeding, newborns | Displaces bilirubin from albumin; the documented concern is kernicterus. A contraindication, not a caution. |
| Berberine | Cyclosporine, tacrolimus | CYP3A4 inhibition substantially raises exposure; a therapeutic-window problem. |
| Berberine | Statins, calcium channel blockers, some sedatives | CYP3A4 substrates accumulate to higher levels than intended. |
| Berberine | Metformin, sulfonylureas, insulin | Independent glucose lowering plus raised metformin exposure; hypoglycaemia risk. |
| Berberine | Warfarin and other anticoagulants | Protein-binding displacement and metabolic effects are documented. |
| Berberine | The gut | Constipation, cramping, diarrhoea and nausea are the most common reported effects. |
| Green tea extract | The liver; hepatotoxic medicines | Concentrated extract linked to rare but serious liver injury; regulator warnings exist. |
| Green tea extract | Warfarin; iron absorption | Variable vitamin K content; catechins reduce non-haem iron absorption. |
| Apple cider vinegar | Diuretics, digoxin, insulin | Regular intake linked to lowered potassium in case reports. |
| Apple cider vinegar | Dental enamel, oesophagus | Acidic; erosion and irritation are documented with regular liquid use. |
This lists interaction considerations documented for these ingredients. It is not a complete list and it is not medical advice. The finished product’s combined profile has not been independently established. Take the ingredient list to a pharmacist before ordering.
What the research actually used
Berberine HCl
An isoquinoline alkaloid found in goldenseal, barberry, Oregon grape and Coptis chinensis, and by a wide margin the most pharmacologically active compound in this formula. It activates AMPK, and human trials and meta-analyses report meaningful improvements in fasting glucose, HbA1c, triglycerides and total cholesterol. For a supplement ingredient that is an unusually solid evidence base.
Researched dose: 900–1,500 mg daily, split across two or three servings. The splitting matters. Berberine has poor oral bioavailability — a small single-digit percentage reaches circulation — and a single large dose reliably causes gastrointestinal upset. Trials divide it for both reasons.
Cautions: the interaction table above, in full. The pregnancy contraindication is the one that admits no exceptions. Berberine is also the reason people describe this ingredient class as “nature’s metformin” — a comparison that flatters the supplement and understates the medicine, and one that has led people to stop prescribed treatment. Do not.
Green Tea Extract
A concentrated source of catechins, principally epigallocatechin gallate (EGCG). Studied for thermogenesis, fat oxidation and insulin sensitivity, with modest and inconsistent human results. The clearest effects appear when caffeine is present alongside the catechins, which is why the caffeinated-versus-decaffeinated question matters and why its absence from the label is a real gap.
Researched dose: roughly 300–800 mg of extract daily, usually standardised to an EGCG percentage. No standardisation is stated here.
Cautions: concentrated green tea extract has been associated with rare but serious liver injury, prompting warnings and cautionary labelling from regulators in several countries. Risk appears higher at large doses and when taken on an empty stomach. Anyone with liver disease should treat this as a specific question rather than a general one.
Apple Cider Vinegar
Acetic acid is the active component, and its effects are real but small: it slows gastric emptying, which blunts the post-meal glucose rise and increases fullness. A handful of small trials have reported modest weight change over about twelve weeks.
Researched dose: roughly 750–1,500 mg equivalent daily, though this is the shakiest figure on the page — because the trials used liquid vinegar, one to two tablespoons, taken with meals. Dehydrated ACV powder is a different product, and unless it is standardised for acetic acid content it may carry very little of the compound doing the work. No standardisation is stated.
Cautions: the potassium and dental considerations above. In capsule form the dental risk largely disappears, which is a genuine advantage of this format.
Magnesium Stearate
Listed by the seller under “Other Ingredients” and correctly described as a manufacturing aid. It is a flow agent that keeps powder moving through machinery, used in a very large proportion of capsules and tablets worldwide. Claims that it suppresses immune function come from a single cell-culture study that does not translate to the amounts used. It is not a concern, and we mention it only because the seller listed it honestly.
The arithmetic that follows from the above. Add the researched doses: berberine 900–1,500 mg, green tea extract 300–800 mg, ACV equivalent 750–1,500 mg. That totals 1,950–3,800 mg. A large size-0 capsule holds roughly 800 mg of powder. The conclusion is unavoidable and does not depend on trusting anyone: at least one of these three ingredients is well below its researched amount, and probably all three are. Which ones, and by how much, is exactly what a published panel would tell you. See the capsule ceiling.
What to ask before you order. Four questions, all answerable in one email: the milligram amount of each of the three actives; the EGCG standardisation of the green tea extract; whether that extract is caffeinated; and the acetic acid content of the ACV powder. A brand confident in its formulation has every reason to answer, and the answers cost nothing to give.
Frequently asked
Three named actives — Green Tea Extract, Apple Cider Vinegar and Berberine HCl — in a proprietary blend, plus magnesium stearate as a manufacturing excipient. No individual amounts are published anywhere on the site.
Berberine, clearly. Its human trials on glucose and lipid markers are the strongest in this formula by a wide margin. It is also the one hardest to deliver in a once-daily capsule, because the researched dose is 900–1,500 mg split across two or three servings.
Ask your prescriber first. Berberine lowers blood glucose independently and also raises metformin exposure through transporter effects, so the combination can contribute to hypoglycaemia. If you do add it with approval, test more often for the first few weeks and tell your prescriber what you started and when.
No. Berberine crosses the placenta and displaces bilirubin from albumin; the documented concern in newborns is kernicterus, a form of brain injury. It is contraindicated in pregnancy, breastfeeding and infants. This is the clearest contraindication attached to any ingredient in this formula.
No. It is a flow agent used in a large share of capsules and tablets. The concern circulating online traces to a single cell-culture study that does not translate to the amounts used in supplements. The seller listed it transparently, which is the correct thing to do.
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