nigella sativa

known, and sold, by several other names:
black seed
black caraway seed
black cumin seed
black onion seed
kalonji
etc

note that "black caraway" and "black cumin" may also be used
for other plants.

used for thousands of years in eastern mediterranean lands
for its culinary and medicinal benefits.
modern medical studies have shown beneficial impacts on
many conditions, including lowering blood pressure, glucose,
triglycerides, and LDL; raising T3; protecting against kidney stones,
etc.
they are high in omega 3 EFA, fiber, protein, calcium, phosphorus,
and antioxidants.
the normal effective doses are 1-2 g / day, which is about what
would be used for culinary purposes.

1/4 c ground seeds weighs 1 oz ( 28 g )
1 tsp is ~ 2 1/3 g