FitSpresso Side Effects: Ingredient-by-Ingredient Safety Guide

Most healthy adults tolerate FitSpresso’s ingredients, but the real label includes several active compounds with known side effects and interactions. Here they are, ingredient by ingredient, with who should avoid FitSpresso and when to stop.

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By QuocNguyen, MSc, Biology Scientist

Medically reviewed by Dr Dave Hepburn · Updated October 2026

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Side effects by ingredient (per 2-capsule serving)

The most common side effects

Digestive upset

Berberine, green tea extract and alpha-lipoic acid can all cause nausea, stomach pain, bloating, constipation or diarrhoea. Taking FitSpresso with breakfast rather than on an empty stomach usually helps, and NIH notes green tea extracts are best taken with food. If symptoms last more than a few days, stop.

Skin reactions

Rash, hives and itching are the most common side effects of oral alpha-lipoic acid, and hives have also been reported with chromium. Stop if you develop a rash.

Trouble sleeping

Ginseng and any natural caffeine from the green tea extract can affect sleep. Take FitSpresso in the morning and keep coffee to the early part of the day.

The important one: low blood sugar

Chromium, berberine, alpha-lipoic acid, banaba and ginseng may each lower blood glucose. In healthy people the effect is small, but with insulin, sulfonylureas or other diabetes medicines it could add up to hypoglycaemia. Health Canada has also reported that alpha-lipoic acid can rarely trigger insulin autoimmune syndrome, which causes low blood sugar. Warning signs include shakiness, sweating, pallor, chills, fast heartbeat, hunger, headache, dizziness and confusion.

Rare but serious reactions

• Liver injury (abdominal pain, dark urine, yellow skin or eyes): stop and see a doctor. NCCIH notes liver problems have been reported mainly with green tea extract pills.
• Severe allergic reaction (swelling of face or throat, difficulty breathing): call emergency services.
• Unusual bleeding or bruising, especially with blood thinners: resveratrol and ginseng may affect clotting.

Who should not take FitSpresso

• Anyone under 18.
• Pregnant or breastfeeding women: NCCIH says berberine may be unsafe in pregnancy and breastfeeding and is likely unsafe for infants; ginseng may be unsafe in pregnancy.
• People with liver disease, unless their doctor approves (green tea extract).
• People allergic to ragweed-family plants (milk thistle).
• Anyone due for surgery in the next two weeks (clotting effects).
• Vegetarians and vegans: the capsule is gelatin.

People with diabetes, thyroid disease, kidney disease or autoimmune conditions, and anyone on regular medication, should check with a doctor. See drug interactions.

How to reduce your risk

1. Talk to your doctor or pharmacist first if you take any medicine.
2. Take 2 capsules with breakfast and water; never exceed the label.
3. Do not stack with other products containing chromium, zinc, berberine, green tea, alpha-lipoic acid or caffeine.
4. Keep a short symptom diary for the first two weeks.
5. Stop if you react, and use the guarantee if it does not suit you.

Reporting a side effect

In the US you can report a suspected reaction to a dietary supplement to the FDA through MedWatch. Tell the seller too (1-877-607-7721), quoting your order and lot number.