what vitamin is hard to absorb in our bodies
21 Important Facts About Vitamin B12 Deficiency Unlike fat-soluble vitamins that accumulate in your body and can have side effects in excess, B12 is a water-soluble vitamin, meaning your body only absorbs a small amount and the rest is excreted through urine, says Middleberg, Good news if you need to refill your stores of this nutrient, but worry about taking too much.