Since there's no known toxicity to vit. B17, a gram will stop the production of errant healing cells (a.k.a. trophoblastic, malignant, cancerous cells). Cancer patients have taken 6 grams (of pills) with meals daily with no harmful side effects. I.V.-Laetrile therapy exceeds that. Pills are convenient and more concentrated than seeds, bamboo & brown rice. If you take B17 on an empty (or near-empty stomach) you will experience nausea/vomiting.