Does shilajit actually work as a supplement?
Be careful. There is little strong evidence that shilajit works, it has no authorised novel-food status in the EU, and unregulated products can contain heavy metals such as lead, arsenic and mercury.
Shilajit is a tar-like substance from rocks, sold for energy, testosterone and ageing. The human evidence is thin and mostly of low quality; solid health benefits have not been shown.
Legally the status is unclear: shilajit is not on the EU list of authorised novel foods and probably falls under the novel-food authorisation requirement.
The biggest practical risk is contamination: because of its geological origin, unpurified products can contain heavy metals (lead, arsenic, mercury), the main reason for warnings. If you still consider it: choose only a product independently tested for heavy metals, and be cautious.
Limited human evidence; EU novel-food status (not on the Union list) and the heavy-metals risk with unregulated products.