Niacinamide Side Effects

Please note - some side effects for Niacinamide may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Side Effects of Niacinamide - for the Consumer

Niacinamide

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Niacinamide:

Diarrhea; dizziness; headache; itching; nausea; stomach upset; temporary feeling of warmth or flushing of the skin.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); black, tarry, or bloody stools; changes in vision; dark urine; decreased urination; fast or irregular heartbeat; loss of appetite; muscle pain or weakness; numbness or persistent tingling of the skin; persistent nausea, vomiting, or general "unwell" feeling; severe or prolonged flushing of the skin; stomach pain; swelling of the hands, legs, or feet; vomit that looks like coffee grounds; yellowing of the skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

Niacinamide with Copper/Folic Acid/Zinc

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Niacinamide with Copper/Folic Acid/Zinc:

Diarrhea; dizziness; headache; stomach upset.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); blurred vision; dark urine; frequent hunger, thirst, or urination; persistent diarrhea, nausea, or vomiting; stomach pain; yellowing of the skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

Niacinamide Gel

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Niacinamide Gel:

Dry skin.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); irritation.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

Side Effects by Body System - for Healthcare Professionals

Cardiovascular

Cardiovascular side effects are rare and mild and have included tachycardia.

Metabolic

Metabolic side effects have included hyperglycemia and hyperuricemia.

Nervous system

Nervous system side effects have included headache.

Gastrointestinal

Gastrointestinal side effects have included bloating, flatulence, diarrhea, stomach upset, and nausea.

Dermatologic

Dermatologic side effects have included increased sebaceous gland activity, dry skin, itching, and rash.

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