1000 µg = 1 mg = 0.001 g

oysters 100 g**
protein 9 g
protein quality 41 %
fat 1 g
LNA (omega 3) 40 mg
EPA (omega 3) 40 mg
DHA (omega 3) 10 mg
good cholesterol 123 mg
vitamin E activity 1 mg
vitamin A 93 µg
vitamin D 8 µg
vitamin B1 160 µg
vitamin B2 200 µg
vitamin B3 2 mg
vitamin B5 320 mg
vitamin B6 220 µg
biotin 10 µg
folic acid 7 µg
vitamin B12 15 µg
calcium 140 mg
phosphorus 157 mg
potassium 184 mg
sodium, minimum 73 mg
sodium, maximum 550 mg
iron 6 mg
zinc, minimum 6.5 mg
zinc, maximum 160 mg
manganese 600 µg
copper 3 mg
nickel 18 µg
vanadium 11 µg
fluoride 120 µg
iodide 58 µg
selenium 19 µg

Oysters (Kaki in Japanese restaurants) can be eaten raw, but you should take into account that they contain an enormous amount of zinc and copper (and also too much sodium if you are susceptible to acne).
High levels of any metal is harmful.
Specifically high levels of zinc increase skin cell proliferation, which will cause the skin to 'tighten'. This may look good, but can also pinch off sebum canals, causing sub-cutaneous inflammations.

** Souci, Fachmann, Kraut;
Food Composition And Nutrition Tables
Medpharm Scientific Publishers Stuttgart