Centrum Active may cause side effects in some users, although many people tolerate it well. Common side effects can include mild gastrointestinal symptoms such as upset stomach, diarrhea, constipation, and changes in stool color (e.g., green stools), especially if the supplement contains iron[3].[7]
Rare but serious side effects may occur, including signs of an allergic reaction such as rash, hives, itching, swelling (particularly of the face, lips, tongue, or throat), trouble breathing, and severe skin reactions[1].[3] Immediate medical attention is recommended if these occur.
Other less common side effects reported with Centrum Active include headaches, flushing of the skin, skin eruptions, sleeplessness, nervousness, hypertension (high blood pressure), euphoria, aching joints, fever, and swelling[7]. Oestrogenic effects (hormonal symptoms) have also been reported.
Some inactive ingredients (such as coloring agents and fillers) in Centrum formulations may cause allergic reactions in sensitive individuals[2]. If you are hypersensitive to any of the ingredients in Centrum Active, you should not take this supplement[7].
If Centrum Active (or any multivitamin containing iron) is consumed in large amounts, especially by children, this can be harmful and potentially life-threatening. Iron overdose is a leading cause of fatal poisoning in children under 6 years of age[4].[8]
Consult a healthcare professional before using if you are taking other medications (especially blood thinners, digoxin, antidepressants, or other supplements), are pregnant or breastfeeding, or have any existing medical conditions[7].
If you experience symptoms such as muscle weakness, numbness, tingling, or very bad stomach problems, contact your doctor immediately[1].
References
- [1] Centrum Side Effects: Common, Severe, Long Term – Drugs.com
- [2] Centrum Multivitamins – Are They Dangerous? – ConsumerLab.com
- [3] Centrum: Indications, Side Effects, Warnings – Drugs.com
- [4] Centrum Active| Haleon HealthPartner
- [7] Centrum Active Multivitamin/Multimineral Supplement 30 Tablets
- [8] Multiple vitamin overdose Information | Mount Sinai – New York