RG means "Reishi Gano" and contains the extracted fruit body of ganoderma. It is harvested after 3 month. RG contains many spores. The mushrooms are being harvested exactly at the right time. If you would harvest the mushrooms too early (before ganoderma opens the spores) or too late (after ganoderma opened the spores and released them) you would waste a lot of precious nutrients.
Here you find more information about RG: Reishi Gano
When you first start taking ganoderma RG goes through your body like a scanner. It detects all your weak points and starts immediately with the regulation.