Our Vision
& Mission

To be the leading innovator in product ideation and formulation for the dietary supplement market.

To create a seamless experience for our clients and work cooperatively towards their success.

Our Core Values

  •   Selflessness

  •  Innovation

  •   Adaptability

  •   Accountability

Lief is a proud sponsor of

Malnutrition is the leading cause of preventable child deaths, and together with Vitamin Angels, Lief is dedicated to creating a healthier world by providing lifesaving vitamins to mothers and children under the age of five at risk of malnutrition, reducing preventable illness, blindness, and death.

Lief is a proud sponsor of

Lief is a proud corporate sponsor of Heart of the Brain non-profit organization. Heart of the Brain is a community of patients, doctors, donors and supporters working toward improving treatment and curing brain cancer. Click below to become a donor too.

USDA Organic Approved Manufacturing Facility

  • LED Lights
  • Recycling
  • Organically Sourced

Our Team

Adel Villalobos

President, Chief Executive Officer

Adel was born with a knack for 2 things; science and baseball. He would eventually use baseball as his motivation to attend California State University Northridge, to obtain his degree in Biochemistry and Nutrition. Once enrolled, Adel further realized his passion for science and decided to focus less on his baseball mitt and more on garnering any experience he can get in what was then a relatively new and burgeoning Nutraceutical Industry.

He eventually landed a part time job as a Customer Service Rep with a company called Natrol. It was at Natrol, where the seed of eventually starting his own company was planted. Adel, was eager to learn and was willing to try his hand in various departments at Natrol, from Customer Service to QC Lab Tech to Marketing, Product Development and even Legal. After moving around all the departments at Natrol, Adel knew what his next step needed to be, and that was to try to make it on his own as a leader in an industry that he has grown to love. In 2008, Adel would eventually go on to start Lief. At the time, equipped with only big dreams and humble beginnings, have now grown into a 114,000 sq. ft. Contract Manufacturing Facility in Valencia California, just 20 minutes north from his home that he shares with his wife and 2 children.

“I love being a part of the professional and personal growth that happens when you are in the Health Sector.  Our industry attracts great people.  Whether it is our staff or our clients. And I am committed to building great relationships and spreading quality supplements worldwide.”

Victor Leyson

Partner, Vice President of Finance

Victor began his career in Finance, working part time for a small boutique accounting firm while obtaining his Bachelor’s Degree at California State University Northridge. Upon completion of his degree, he went on to work at a larger management firm that focused on representing publicly traded companies and The Entertainment Industry, in which he would manage the latter.

His experience managing high maintenance, high net worth individuals, and growing weary of the 8-5 routine, lead to him starting his own small consulting company in 2009 called Leyson Management, with Lief as one of his first clients.

As Lief, grew, so did Victor’s role and what started out as a “part-time” arrangement, gradually turned into full time employment.

“I was fortunate enough to get an early glimpse of Lief’s potential and believed that there was an opportunity to really build something. I enjoyed the flexibility of the consulting life, but missed the energy of being part of a dynamic group. I also felt like, having the chance to manage the intricate finances of a company from its infancy stage would provide an exciting challenge along with even greater opportunities to learn and grow within my career in finance. So, when the time came to discuss full time employment, it felt like the natural decision for me to make.”

Nathan Cox

Partner, Vice President of Sales & Business Development

Nathan’s passion for health and fitness started early in life while he was in the fire academy. It was there where he learned the importance of proper supplementation and how it can help maximize training results.

After completing his Bachelors in Communications Advertising from Cal State Fullerton, he started to build some industry experience working in sales for various pharma and manufacturing companies.  Nate quickly discovered that his interests went beyond just the sales side; he wanted to learn how to build and expand a company through sales, business development and innovation.

That is what ultimately lead him to Lief. “I became obsessed with the idea of creating. Seeing a product being sold on a shelf that I was a part of developing became addicting. I took pride in my work and quickly learned every aspect of the industry to accelerate my growth. And I knew that Lief would provide the support and resources to make some of my ideas come to fruition. Seeing products sold worldwide that I played a role in is very rewarding. I will continue my education in the industry so I can be the best asset to my loyal brands. At the end of the day, if our customers succeed then Lief does too.”

Dieng Bui

Vice President of Operations

When Dieng Bui and Adel Villalobos met back in college, both majoring in Biochemistry... they vowed to one day work together, but little did they know just how circuitous that path would be. Early in Dieng’s career he thought that the world of the Pharmacist was his calling, and it was Adel that convinced him to get more involved in the Science and Operational side of things, which lead to his first job at Natrol, a company, which at the time, was a real pioneer of the supplement manufacturing world and paving a path of growth and expansion for the industry as a whole. It was at Natrol where Dieng really cut his teeth and garnered the experience needed to one day lead an Operations Department of his own. Dieng spent 17 years of his career, like a sponge, absorbing as much knowledge and experience as he could with cGMP and FDA guidelines and patiently moved up the corporate ranks at Natrol with great alacrity. At this point Dieng knew that he was ready for a change, and so was Lief. After years of keeping in touch and supporting each other’s careers from a distance, Lief, was fortunate enough to have Dieng join its team as its Vice President of Operations in September of 2017. "Dedication and Loyalty are some of the qualities that I value most, Dieng not only possesses both these attributes in spades, but he is also a very strategic and empathetic leader. He understands what it takes to get the job done and delivers on time for our customers" - says Adel Villalobos, Dieng Bui's CEO.

Board of Directors

Leo Fernandez

Board Member

Mr. Fernandez is a Managing Director and Founder of Envisage Advisors and its predecessor firm, R2F Investment Bankers. He has 20 years of experience in corporate and investment banking, including acquisition finance, real estate finance, financial advisory and debt underwriting and distribution.

Prior to founding R2F Investment Bankers, Mr. Fernandez was a Managing Director for Columbia West Capital, LLC, a boutique investment banking firm focused on the Southwestern United States. He was responsible for sourcing and executing mergers and acquisition and capital raising assignments for middle market companies in California and Nevada. Before joining Columbia West Capital, Mr. Fernandez was the co-head of CIBC World Markets’ West Coast Leveraged Finance and Gaming, Lodging and Leisure practices. In Mr. Fernandez’ ten years at CIBC, he worked actively with numerous strategic companies and private equity firms to originate, structure and distribute high yield issues, bank financings and private placements in various industries. Prior to joining CIBC, he was a bond analyst for Trust Company of the West’s High Yield Bond Group as well as a generalist in the Specialized Finance group at Union Bank of California. Mr. Fernandez is on the Board of Directors of Latino Deal Makers.

Mr. Fernandez holds degrees in Economics and History from Claremont McKenna College. Mr. Fernandez is registered with the FINRA (formerly NASD) and has a series 7 and 63 securities license.

Michael Maroney

Board Member

Michael J. Maroney has spent the past four plus decades representing, guiding and advising successful businesses and individuals in the Business, Entertainment and Motorsports Industries as a Lawyer, Advisor, Facilitator and General Counsel. A former professional motorsport athlete, past and present clients include global public and private business entities in various industries from Aerospace to Construction to Nutritional Supplement Manufacturing, Award Winning Producers, Engineers and Personalities in Music, Film & Television and Championship Winning Motorsports Race Team, Race Car Drivers and Technical personnel.

Highlights include: Forged and guided, through initial contact and due diligence to complete acquisition and merger, of a privately owned, highly respected and award winning Southern California prototype Aerospace business, responsible for placing the Lunar Landing Module and Astronauts on the Moon in the 1960's, over 150 parts and components in the initial Mars Rover for it's Mars exploration which continues to work today, developed Space Shuttle propulsion capabilities, various Weapons and Defense Systems, advances in Spinal Medical Implantation Devices and many others projects, to a division of Kodak Corporation, one of the largest global public companies in history. Several years later, completed a full buy back of the entity from the Kodak Corporation to a privately owned organization.

Representing, as General Counsel, one of the absolute most reputable and fastest growing Nutritional Supplement Contract Manufacturers in North America. Responsible for all legal dealings across the board, from business development, to employee issues to intellectual property to expansion and coordination of any associated outside counsel to operate the business on a day to day basis.

Specialties: The networking, guiding and creation of a "winning legal minded performance culture" to maximize goals for talented individuals and businesses from the grass roots/start up level to the absolute pinnacle in Business, Entertainment and Motorsports. The procuring, developing and facilitation of top opportunities for talent and business owners and the expert understanding, negotiation, drafting and enforcement of all agreements to guide these clients in all of their business endeavors. A complete understanding of all aspects of civil litigation from simple to global complex issues, involving business to construction to real estate to mergers and acquisitions to Trademarking to business development to sale at the global corporate level.

Alex Guerrero

Board Member

Alex Guerrero is the Chief Development Officer for a leading non-profit small business lender with headquarters in Los Angeles and with offices in Chicago, and New York. As Chief Development Officer, he is relationship manager to all banking and foundation partners and oversees all technical assistance programs, government and community affairs, economic development initiatives, construction projects, and real estate holdings.

Prior to his current role, Alex held the position of Chief Operating Officer & Executive Vice President of Tower General Contractors, the largest minority owned general contracting firm in Los Angeles County, where he was a vital part of their success. During his tenure the company was ranked among the “Fastest Growing Companies” by the Los Angeles Business Journal and 1st in “Best Places to Work” by the SFVBJ.

While at Tower General Contractors he directed the company’s growth to one of the top General Contractors in California overseeing construction and expansion of several hospitals, low income housing, assisted living, Alzheimer care units, construction of the Columbia Space Shuttle Museum, Renovations to the Beverly Hills City Hall, expansion of the Gibson Amphitheater, reconstruction of the iconic Theme building at LAX and the design and build of Laborers Local 300 Los Angeles headquarters.

Alex served as Management’s Representative on the National Committee for Apprenticeship for the Laborers International Union of North America (LIUNA), where he was tasked with strategy and tactics for quality & sustainable job creation throughout North America.

Alex is very involved in Los Angeles civic duty and active in several nonprofit organizations including sitting on the Board of Directors of the Valley Presbyterian Hospital in Los Angeles. He and his wife are Los Angeles County Foster Parents as well as opening their home up to animal rescue, fostering some 30 dogs per year on their way to forever homes.

Alex Guerrero is a graduate of the University of Southern California’s Marshall School of Business.

a Quote

It is our mission to spread health awareness. If you're interested in a cGMP and NSF certified manufacturer, let us know how we could be of service and create a seamless partnership between you and Lief.


  • +1-661-775-2500
  • 28510 W Industry Drive
    Valencia, CA 91355
    United States
  • Mon. - Fri. 8am to 5pm


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