Here's what we found in popular Shilajit products when we conducted tests in 2016 at the Consumer Wellness Center mass-spec lab. Composition may have changed since this, but all these products were on the market in 2016 and being routinely sold to consumers:

ALUMINUM results (ppb) published by the Consumer Wellness Center
Shilajit Supreme (HealthForce) = 1303344 ppb
Shilajit Powder (Ojio) = 66019 ppb
Authentic Shilajit (Lotus Blooming Herbs) = 122521 ppb
Shilajit Fulvic Acid Complex (Jarrow Formulas) = 18952 ppb
Shilajit Powder (The Right Herb Company) = 24811 ppb
Shilajit (Vitajing Herbs) = 31040 ppb
High Mountain Shilajit (Dragon Herbs) = 1188975 ppb
Shilajit (Pure Himalayan) = 511910 ppb

LEAD results (ppb) published by the Consumer Wellness Center
Shilajit Supreme (HealthForce) = 2814 ppb
Shilajit Powder (Ojio) = 70 ppb
Authentic Shilajit (Lotus Blooming Herbs) = 396 ppb
Shilajit Fulvic Acid Complex (Jarrow Formulas) = 414 ppb
Shilajit Powder (The Right Herb Company) = 97 ppb
Shilajit (Vitajing Herbs) = 141 ppb
High Mountain Shilajit (Dragon Herbs) = 1561 ppb
Shilajit (Pure Himalayan) = 1134 ppb