Elderberry safety studies
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Elderberry Safety: Clinical Trials and Systematic Reviews
Multiple systematic reviews and clinical trials have evaluated the safety of elderberry (Sambucus nigra) in humans. Overall, these studies suggest that elderberry is generally safe for use in adults for short-term treatment of viral respiratory illnesses, such as influenza and the common cold, with no significant reports of serious adverse effects or toxicity in the reviewed clinical trials and meta-analyses 1246+2 MORE.
Toxicological and Animal Studies on Elderberry Safety
Animal studies investigating the effects of anthocyanin-rich elderberry extracts in mice found no evidence of toxicological effects on liver or kidney structure or function, even at higher doses. Some minor histological changes were observed, but these were not considered to have pathological significance. These findings support the favorable safety profile of elderberry extracts, even when used as a food additive or natural colorant 35.
Elderberry and Immune System Concerns
There has been concern that elderberry might overstimulate the immune system and increase the risk of a “cytokine storm,” especially during viral infections. However, systematic reviews found no clinical evidence linking elderberry to harmful inflammatory outcomes. While some studies noted that elderberry can affect inflammatory markers, these effects may decrease with ongoing supplementation, and no evidence was found that elderberry causes dangerous immune overstimulation .
Safety in Special Populations: Pregnancy
There is a lack of safety data regarding elderberry use during pregnancy. No animal or human studies have specifically evaluated the safety of elderberry in pregnant women. Due to this lack of evidence, health care professionals are advised not to recommend elderberry for upper respiratory tract infections during pregnancy .
Regulatory Status and General Safety
Elderberry is recognized as generally safe by regulatory authorities such as the United States Food and Drug Administration for use as a dietary supplement and food ingredient. However, the absence of large-scale, long-term safety studies means that recommendations for widespread or prolonged use should be made with caution, especially in vulnerable populations 18.
Adverse Events and Comparative Safety
Clinical trials comparing elderberry to standard antiviral medications or placebo found that elderberry was not associated with an increased risk of adverse events. In some studies, elderberry-containing products were associated with a lower risk of complications and adverse events compared to standard treatments like oseltamivir, though the evidence is not definitive and more research is needed 24.
Conclusion
Current evidence from clinical trials, systematic reviews, and animal studies suggests that elderberry is generally safe for short-term use in healthy adults for the treatment of viral respiratory illnesses. There is no evidence that elderberry causes serious adverse effects or immune overstimulation. However, safety in pregnancy and with long-term use remains unproven, and further research is needed to confirm these findings in larger and more diverse populations.
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