Contamination with heavy metals in other tongkat ali is associated with risks of severe nerve and brain damage [1] [2] [3] [4] [5]. Our tongkat ali may be a little more expensive, but it is harvested in jungles far from any civilisation and certified free of heavy metals. Read more here

References:

1 Heavy Metal: Lead and the Brain, Psychology Today, Jan 23, 2016

2 Heavy Metal Poisoning, NORD

3 Heavy Metals Toxicity and the Environment, EXS. 2012; 101: 133?164.

4 Toxicity, mechanism and health effects of some heavy metals, Interdiscip Toxicol. 2014 Jun; 7(2): 60?72.

5 Metal toxicity in the central nervous system., Environ Health Perspect. 1987 Nov; 75: 59?64.