Schisandra supplements — whether in dried fruit or pill form — are the most contaminated adaptogens tested, with lead and nickel levels way over safety limits, making them riskier than other popular adaptogens.

26

Pro

0

Against

Evidence from Studies

Supporting (1)

26

Community contributions welcome

26

Heavy Metal Contamination in Adaptogenic Herbal Dietary Supplements: Experimental, Assessment and Regulatory Safety Perspectives

Cross-Sectional Study

2025 Oct 23

The study tested herbal supplements and found that Schisandra products had the highest levels of lead and nickel, sometimes more than double the safe limit, especially in tablets.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Heavy Metal Contamination in Adaptogenic Herbal Dietary Supplements: Experimental, Assessment and Regulatory Safety Perspectives

Score: 26

DOI: 10.3390/biology14111479

Similar Assertions

Some herbal supplements sold in Poland might be contaminated with dangerous levels of lead and nickel — heavy metals that can harm your brain and even cause cancer — and most of the ones tested weren't safe.

26

0

70%