Apple Cider Vinegar

Apple cider vinegar is permitted without conditions, and it has more claims around it than evidence. These are the questions our naturopaths ask in store, mostly about dose, format and your teeth.

A good fit if

• You'll take it diluted, with food, at 15 to 30 mL a day
• You want the after-meal effect, which is the best-supported thing it does
• You're willing to check the acetic acid content on a capsule label, or go with the liquid instead
• You'd rather be told which claims we can't stand behind

Check with us first if

• You take diabetes medicine or insulin. There's no interaction data, and the way it works is clear enough that it's worth a conversation.
• You take a diuretic that lowers potassium, digoxin or laxatives. It's the same reasoning, and a case report shows real potassium loss at high intakes.
• You have reflux or an existing stomach problem, since vinegar is an acid and there's no evidence it reduces stomach acid.
• You already have worn enamel or sensitive teeth.
• You're pregnant, breastfeeding or buying for a child. There's no evidence at all for these groups.
• You're taking it for a diagnosed condition rather than alongside meals.

• Liquid, raw and unfiltered (with the mother). Best known for: Everything the human trials actually tested. Absorption: 15 to 30 mL a day diluted, delivering 750 to 1,500 mg of acetic acid. Typical use: No study compares raw-with-mother against filtered in humans, so the mother's benefit is unproven.
• Liquid, filtered or pasteurised. Best known for: Clear, longer shelf life. Absorption: Same acetic acid content, same trial doses. Typical use: Human trials rarely specify which they used, so the evidence arguably covers both.
• Capsules and tablets. Best known for: No taste, no tooth contact. Absorption: This is the gap that matters. Pills used as placebo controls carried 1 to 2% of a 15 mL liquid serve. Typical use: Look for a stated acetic acid content. And know that most products don't state one. The upside is real: the pill arm showed no tooth wear.
• Gummies. Best known for: Palatable and popular. Absorption: No human trial of any apple cider vinegar gummy exists in our sources. Typical use: Acid content is generally low and the sugar works against the reason you're taking it.
• Powders and drink sachets. Best known for: Convenience. Absorption: No human trial. Typical use: Usually dried onto a maltodextrin carrier.
• Topical soaks and rinses. Best known for: Diluted to about 0.5% acetic acid. Absorption: Two controlled human tests found no barrier or microbiome benefit. Typical use: Almost three-quarters of subjects reported irritation. We won't recommend it.
• Generic vinegar in a medicine. Best known for: A regulatory distinction worth knowing. Absorption: Not applicable. Typical use: Schedule 1 permits generic vinegar only as a flavour, capped at 5%. Apple cider vinegar has its own unconditional item and can be the active.

Reference values. There's no recommended intake for apple cider vinegar. It's a food and a ferment, not a nutrient.

Typical supplemental range. 15 to 30 mL a day of liquid, diluted in water and taken with meals. 15 mL gives you about 750 mg of acetic acid and 30 mL about 1,500 mg. One analysis found you need more than 10 mL a day to see an effect on blood sugar.

Upper level. Australia's permitted ingredients list (Schedule 1) sets no cap. The practical limit is the trial range of 15 to 30 mL a day. Harm shows up well above that: tooth enamel wear at 3.6 g of acetic acid a day over eight weeks, and one case report of low potassium and osteoporosis after roughly 250 mL a day for six years, which is about ten times the highest trial dose.

Worth knowing. Dilute it, drink it with a meal rather than sipping it through the day, and don't brush your teeth straight after. If you're buying capsules, look for the acetic acid content, not the total milligrams. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• Apple cider vinegar as a food: the same bottle on a supermarket shelf is a food under the Food Standards Code, not a listed medicine
• Other vinegars: the postprandial glucose finding covers vinegar generally, not apple cider vinegar specifically
• Other fruit vinegars: don't generalise across them: a fermented Prunus mume vinegar trial for fatigue was null

This list is the part of the page we will not shorten. If any of it applies to you, talk to one of our naturopaths or your doctor before starting.

• Your teeth. A randomised trial with blinded dental assessment found 3.6 g of acetic acid a day for eight weeks raised erosive wear scores 18%. Enamel doesn't grow back. Dilute it, drink it with a meal rather than sipping, and don't brush straight afterwards.
• Very high, prolonged intake. A case report describes a woman taking about 250 mL a day for six years with hypokalaemia, urinary potassium wasting and osteoporosis at a bone density T-score of -3.0. That's roughly ten times the highest trial dose.
• Tablets that lodge in the oesophagus. An adverse event report describes oesophageal injury from an apple cider vinegar tablet. Take tablets upright with plenty of water.
• Skin. Daily dilute soaks caused mild side effects in almost three-quarters of subjects in a controlled trial, with no barrier or microbiome benefit. Undiluted topical use can damage skin.
• Reflux and stomach complaints. Vinegar is an acid, and there's no evidence it reduces stomach acid. Any indigestion positioning for vinegar points the opposite way, on traditional grounds only.
• Diabetes medicines, insulin, potassium-depleting diuretics, digoxin and laxatives. No interaction data exists in our sources. Mechanism isn't evidence, so we won't write one up as if it were. Ask your prescriber.
• Pregnancy, breastfeeding and children. No data located in any of those groups.
• Product quality. A laboratory analysis of eight tablet brands found wide variation in pH and acid content, and couldn't confirm apple cider vinegar was present at all.