HMB is a by product or metabolite of the essential Amino acid Leucine. HMB is produced in the bodyfrom the protein in our diets and is also consumed in small amounts from the food that we eat.
However only 5% of the Leucine that you eat is converted into HMB, For the production of HMB to reach optimal gram quantities you will need 20 to 30 grams of Leucine. Consequently getting enough from your diet alone.