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SYMPTOMS

Bloating or gas

Everyday reasons for bloating, what to ask your doctor to check, and which nutrients have been studied.

Also described as: bloat, bloating, bloated, gassy, flatulen, distension, distended, belly swell

Common everyday causes

Gut-bacteria imbalance

Antibiotics, acid reducers, stress and low-fiber eating shift the gut bacteria, which shows up as bloating, gas and irregularity — sometimes skin and mood too. Usually no test is needed. If it lasts more than 4–6 weeks, see your doctor.

A food that doesn’t agree with you

Lactose, gluten and fermentable carbs (FODMAPs) are the usual suspects for bloating and irregularity; celiac disease must be tested before going gluten-free. Try 2 weeks without the suspected food. Before cutting gluten, ask for a celiac blood test (tTG-IgA).

A slow-emptying stomach (indigestion)

When the stomach empties slowly or is extra sensitive, you feel full and bloated soon after eating, even after small meals. Ginger helps the stomach empty. No test needed at first. See a doctor if you’re 60 or older, losing weight, vomiting, or it keeps getting worse.

Slow transit (too little fiber or fluid)

Without enough soluble fiber and water, stool moves slowly — the commonest cause of constipation and of the bloating that comes with it. No test needed at first. See your doctor if it lasts more than 3 months or comes with bleeding or weight loss.

Bacterial overgrowth in the small intestine (SIBO)

Bacteria growing too high in the gut ferment food early, so bloating starts soon after eating. Acid reducers and slow motility raise the risk. It’s treated with prescribed antibiotics, not supplements; fiber can make it worse. Ask your doctor about a SIBO breath test.

Sensitivity to your cycle’s hormone shifts

In the week before a period, falling estrogen and progesterone change serotonin, fluid balance and pain sensitivity. Calcium, B6 and magnesium have the best evidence. Track symptoms for 2 cycles; ask your doctor if they disrupt daily life (PMDD is treatable).

If you take certain medicines

GLP-1 medicine: eating less protein and nutrients

GLP-1 medicines cut appetite so much that protein and micronutrients often fall short; fast weight loss also triggers hair shedding. Ask for B12, ferritin and vitamin D tests; aim for 25–30 g of protein per meal.

Acid reducer lowering magnesium and B12

Long-term acid reducers (especially PPIs) lower magnesium and B12 absorption. Ask for magnesium and B12 tests, and whether you still need the acid reducer.

What’s been studied

• Bacillus coagulans

  For gut balance.

• Ginger

  For slow stomach emptying.

• Calcium

  For cycle hormones.

• Vitamin B6

  For cycle hormones.

• Chaste tree berry

  For cycle hormones.

• Saffron

  For cycle hormones.

• Magnesium

  For slow transit.

• Magnesium

  For cycle hormones.

• Vitamin B12

  For GLP-1 medicine.

apiece asks a few quick questions about bloating in its quiz to tell these causes apart, and suggests only ingredients studied for the likely ones.

Questions

What can cause bloating?

Common everyday reasons include gut balance, a food reaction, slow stomach emptying, slow transit, SIBO. A doctor can help find which applies to you.

What tests can help explain bloating?

Ask your doctor about: Usually no test is needed. If it lasts more than 4–6 weeks, see your doctor; Try 2 weeks without the suspected food. Before cutting gluten, ask for a celiac blood test (tTG-IgA); No test needed at first. See a doctor if you’re 60 or older, losing weight, vomiting, or it keeps getting worse; No test needed at first. See your doctor if it lasts more than 3 months or comes with bleeding or weight loss; Ask your doctor about a SIBO breath test; Track symptoms for 2 cycles; ask your doctor if they disrupt daily life (PMDD is treatable).

Which supplements are studied for bloating?

Depending on the cause: Bacillus coagulans, Ginger, Calcium, Vitamin B6, Chaste tree berry, Saffron, Magnesium, Magnesium, Vitamin B12. Some only make sense with a lab result (for example iron only when ferritin is low).*

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.