A: Yes. Traditional kombucha cultures have evolved to feed on granulated white sugar and cannot properly ferment without it. Thick sugars like turbinado, sugar in the raw, and brown sugar are too difficult for the culture to break down and process. Also, always avoid alternative sugars like honey, stevia, etc. as the culture will struggle to thrive. For reference, we use Wholesome Sweeteners Evaporated Cane Juice (Organic Sugar) in our brewing kits.