negative regulation of testosterone biosynthetic process
Any process that stops, prevents, or reduces the frequency, rate or extent of testosterone biosynthetic process.
GO:0010894
negative regulation of steroid biosynthetic process
is_a
GO:0062014
negative regulation of small molecule metabolic process
is_a
GO:2000224
regulation of testosterone biosynthetic process
is_a
GO:0061370
testosterone biosynthetic process
negatively_regulates