The Evolution of Essential Amino Acids: Jim Heflin and the Creation of Density

Dec 5th 2025

The Evolution of Essential Amino Acids: Jim Heflin and the Creation of Density

Editor’s note:  Jim Heflin, the original owner of Beverly International, played a pioneering role in advancing the world of sports nutrition from the 1970s through the 1990s. His vision and commitment to enhancing the performance of bodybuilders led to the development of groundbreaking products that addressed the critical nutritional needs of athletes. Heflin's innovative approach to formulating supplements has had a lasting impact on the industry. His dedication to research and collaboration with experts has established Beverly International as a trusted name among bodybuilders and fitness enthusiasts alike. Heflin’s contributions continue to resonate today, underscoring the importance of quality ingredients and effective formulations in achieving optimal athletic performance.

The Origins of Density

In the 1980s, Jim Heflin recognized the importance of providing advanced bodybuilders with adequate amounts of essential amino acids (EAAs) to meet their metabolic needs. EAAs play a crucial role in muscle building, fat burning, and workout recovery, and it is essential to have them in optimal amounts to achieve the desired results.

In developing the Density formula, he consulted with a recognized Ph.D. chemist, Bill Lahl, who had expertise in amino acid research and experience in pharmaceutical applications. He suggested using equal amounts of EAAs as occurs in the current Density formula (500 mg of each EAA).

Here's an excerpt from an interview with Beverly International founder Jim Heflin:

The equal amounts of each essential amino acid allow the body to convert them and adapt them as it needs. Instead of us deciding how much you need of each, it provides ample amounts your body can use as needed. Enough to fill in any amounts that your body is lacking of an amino acid. The specific amount your body needs of each amino acid varies at any given time.

Flood the system and then allow the conversion to the other 10 non-essential aminos. This is the biggest and most important reason for combining all 8 essentials in large amounts. Not only are they the most important aminos, but they convert and create all other aminos. Your body will dictate which other aminos it needs to make from these 8 essentials. It assures you get exactly what you need. Even though it’s impossible for you to know what’s lacking, your body does always know what it needs, and it will use these 8 essential aminos (if there are enough of them) to construct what it needs.

Jim goes on to say, Density was the one product we couldn’t keep on the shelf. Everybody was taking it! No bodybuilder would think about competing without it at the time.

No one has ever had a product that compares.

Having large, equal amounts of all 8 essentials ensures that you won’t be deficient. With these amounts, there’s no way you can fall short and not happen to have enough to build muscle, recover, and replenish.  You never know when you might be deficient in something, and that one deficient amino acid can keep you from building more muscle, recovering, burning fat instead of muscle, etc. It’s impossible to know when you don’t have enough of something in your body, and Density keeps you from having to worry about that.

No one has ever had a product that compares. All the other essential amino products never had enough. They would often have a lot of the cheapest amino acids and little or none of the expensive ones. A lot of the stuff on the market back then was animal-grade, which is totally useless for humans.

We developed Density in the late ’80s. What’s funny is that we were so ahead of the game; people are just now starting to learn about the effectiveness of the ingredients and aminos we were putting together 30 years ago. One iconic movie star took tons of the stuff as he made a radical physical transformation during the late 70s and early 80s.

Order Density today and ensure you're never deficient in the vital nutrients your body needs to perform at its best. Join the ranks of athletes who trust Density for their training and transformation. Get yours now and feel the difference!