How do steroids travel in the bloodstream?
Steroid hormones are transported in an inactive form bound to proteins in the bloodstream. Androgens and estrogen are bound to Sex hormone-binding globulin (SHBG), while glucocorticoids and progestins are bound to transcortin.

References:


Transport of steroid hormones: binding of 21 endogenous steroids to
both testosterone-binding globulin and corticosteroid-binding
globulin in human plasma.
Plasma protein-mediated transport of steroid and thyroid hormones.
The Functions of Corticosteroid-Binding Globulin and Sex
Hormone-Binding Globulin: Recent Advances