Shelving posts and shelving supports for use in adjustable shelving systems that reduce the space lost to the posts and shelf supports. The shelving posts do away with bulky RHS and SHS shaped posts with apertures formed therein and replace them with planar vertical member or members that are attached to one or more fins which extend perpendicularly from the planar vertical member or members. The fins provide structural support for supporting shelves and the goods that will be placed on them. The fins are orientated such that they sit between adjacent shelves. Shelf supports include flat planar shelf arms. The Shelf supports have a vertical stop which abuts a fin of the shelving post to provide additional support to the shelves. In addition, the shelf supports also have a perpendicular planar portion which also provides additional rigidity and strength to the shelf support.