The amount of organic cannabinoids present. CBD is just one of many cannabinoids found in the hemp plant, and many others are shown to have synergistic properties when used alongside CBD. Full spectrum CBD is the completely unaltered resin taken straight from a low-THC plant. Broad spectrum is the same except the THC is completely removed.As THC content is only allowed under 0.2% by UK law, Broad Spectrum CBD is the safest way to enjoy CBD.