The various SSS controls all affect each other, and I have been adjusting them in the order here. The Subsurface value is the overall amount or scale of the SSS effect (I don’t believe that the values in this node are affected by what units are set in the preferences), and changing the SSS Method to random walk uses more accurate volumetric calculations (so should be used with a closed mesh). The Subsurface Radius values control the depth that Red, Green and Blue light will penetrate and scatter back. Subsurface Colour affects the Base colour which will be more or less noticeable depending on the scale as set by the Subsurface value.

Illustration of the relationship between Radius, Subsurface colour and Base colour, with Blue light set to penetrate to a greater depth and therefore scatter more and give a blue tint to the thinner parts of the mesh:

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