One milligram (mg) equals 1000 micrograms (mcg). Therefore 0.137 milligrams is the same as 137 micrograms. As Cheryl said, 150 micrograms is only 13 more micrograms than 137 micrograms. Less than a 10% increase.
I guess this stuff is easier if you are used to metric measurements.
You know I get really confused myself ... I *think* it is similar to going from 137mcgs to 150 mcgs .. or a strength added more of aprox. 13mcgs?
OTHERS JUMP IN ... this is not my speciality LOL!
Cheryl