How can I make an organic object shine from within in order to have a subsurface scattering effect on the skin?
Welcome 
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…well use the Subsurfaces values in the Principled BSDF node (here 0.44) and put a light into the object…
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You gave me a great idea, thank you
According ideas: … you could of course make the object somekind of transparent… maybe using multiple layers/values… maybe more than one… to fake this… it depends… what your intentions/goals are or what is faster 