A complete safety, timing, and dosage guide for combining Apple Cider Vinegar (capsules/gummies) with Vitamin B1 (Thiamine) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take vitamin B1 and apple cider vinegar together safely; they do not interact, although take ACV with meals to avoid stomach upset.
Vitamin B1 and apple cider vinegar together show no meaningful interaction. Taking them at the same time is safe, and the only practical caution is to avoid high doses of ACV on an empty stomach to prevent digestive irritation. Both can be part of a healthy daily routine without concern.
Thiamine (vitamin B1) is a water-soluble vitamin absorbed primarily in the jejunum and ileum via specific thiamine transporters (THTR-1 and THTR-2) with passive diffusion at high doses. Apple cider vinegar contains acetic acid and polyphenols that can lower stomach pH, but thiamine is not dependent on gastric acid for absorption and is actually stable in acidic environments. There is no shared transporter, receptor, or cytochrome P450 pathway between these two compounds, so they do not compete or interfere. The only potential indirect effect is that ACV can slow gastric emptying if taken in large amounts, which could slightly delay but not prevent thiamine absorption, and this is not clinically meaningful. Both substances are eliminated through normal metabolic and renal routes without affecting each other's clearance.
For daily use, take your thiamine with breakfast, such as with eggs or oatmeal, and take your ACV capsule with lunch or dinner to minimize any overlap of stomach acid and food. If you prefer to take both together, do so mid-morning with a full meal and a full glass of water, which helps blunt the acidity of ACV. If you miss a thiamine dose, take it with your next meal and continue your schedule; if you miss an ACV dose, simply skip it and resume the next day—never double up. Start ACV at the lowest labeled dose to assess tolerance, and always follow the label instructions for both supplements. Avoid taking either on an empty stomach, as thiamine absorption is best with food and ACV can irritate the stomach lining without food.
Thiamine is most commonly available as thiamine hydrochloride, which is well absorbed and water-soluble, while benfotiamine is a lipid-soluble derivative with higher bioavailability but is a different form of vitamin B1. Apple cider vinegar capsules generally contain dry powdered ACV with lower acetic acid content than liquid vinegar, while gummies add sugars and may be less concentrated; however, both forms are safe with thiamine. None of these form differences create a new interaction with thiamine, but they affect how much ACV you are actually getting and how likely you are to experience stomach upset. If you are sensitive to acidity, choose capsules with an enteric coating or take a lower dose.
Thiamine is commonly found in B-complex multivitamins and energy formulas alongside magnesium and alpha-lipoic acid, while apple cider vinegar appears in weight-management and blood sugar support stacks. This specific pairing is not a classic combination, but it may coexist in broader metabolic health supplements.
Yes, you can take them at the same time with a meal. I do not know of any interaction that would make it unsafe. Just make sure you swallow the ACV capsule with plenty of water to avoid throat irritation.
Yes, it is safe to take both daily as long as you stick to reasonable doses. I would take ACV with food and not exceed the labeled serving, usually 1–2 capsules, because high amounts can affect potassium levels over time. Vitamin B1 is water-soluble, so any excess is excreted in urine.
You do not need to wait between them. If you prefer to be extra cautious about stomach upset, take them 30–60 minutes apart, but that is not necessary. Both are absorbed in different parts of the digestive tract, so spacing them does not change anything.
No, they do not compete. Vitamin B1 is absorbed in the small intestine by a specific transporter, and the components of apple cider vinegar are absorbed elsewhere or metabolized quickly, so there is no shared pathway. I have seen no evidence of any competition or interference.
Most adults can take them together safely. I would recommend talking to your doctor if you have chronic kidney disease, are on potassium-lowering diuretics, take digoxin, or have gastroparesis, because ACV can affect potassium and stomach emptying. Otherwise, no specific group needs to avoid this combination.
Take both with food. Thiamine is best absorbed with a meal, and ACV is less likely to cause stomach irritation or reflux when taken with food. Avoid taking ACV on an empty stomach, as that is the most common cause of digestive discomfort.
Reviewed by Caroline M. on April 14, 2026 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.