NPK INDUSTRIES - RAW B-VITAMIN - 900GRIn addition to 1% water soluble vitamin B1, RAW B Vitamin contains 9% magnesium, making it an optimal magnesium supplement. RAW B Vitamin is most beneficial during transplant, times of stress and during heavy fruit and flower production. Raw B Vitamin can be used at all times of growth and bloom and is a beneficial supplement to all feeding schedules. Works in conjunction with all nutrient and feeding programs.