The logo is a G in an octagon shape that matches greenstone picture. followed by 600.It is white and oblong in shape.
Thankyou for identifying that your pill is manufactured by Greenstone. Unfortunately I have been unable to id it. You could try contacting them direct (let us know how you get on)
100 Route 206 North
Peapack, NJ 07977
Greenstone Customer Service, Toll Free:1.800.447.3360
Medical Information, Drug Safety and Complaints: 1.800.438.1985
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