300,000 Certifications Worldwide

143 Countries Around The Globe

30+ Years in Fitness Certifications

No Credit Checks. No Fees. No Taxes.

Job Guarantee

Combining Supplements

Get Started Now

About The Course

It is common for individuals who experiment with supplements to incorporate two or more products into their daily routine. The mentality that if one is good, two must be better, is a purveying thought process in many supplement users. We like to think that if we take two supplements, the combined effect is equal to the sum of their individual effects. In other words, one plus one equals two. This is the simple and logical scenario, where the effects of each supplement are independent of the other.

But what we do not always realize is that supplements, even natural ones, are chemicals, and that combining two or more can alter the intended effects in potentially undesirable ways. Unfortunately, the available peer-reviewed clinical research on the effects of taking multiple supplements simultaneously is scarce; nonetheless, for educational purposes the point to keep in mind is that the use of dietary supplements is not always simple math. In fact, in the case of supplements, one plus one does not always equal two.

Features online enrollment, online exam and instant grading as well as automatic certificate generation upon completion of course.

Hear how ISSA has helped students like you

My experiences with ISSA have led me to be a very successful and respected Personal Trainer and I love Personal Training!

Maureen Langevin

The amount of knowledge in the textbook is really satisfying for someone who’s interested in both fitness and the sciences of the human body, and who’s willing to learn about the relationships between them.

Jehad Refaat Abdel Hamid

I thank ISSA, their entire team for designing such a course and helping me to make my passion a Profession.

Kshitij Mishra

I feel I can give my best to my clients and continue to further my education so I can give them the most up to date and relevant information.

Lundyn Wyllie

The ISSA program provided me with the flexibility to achieve my certification while maintaining a full time career, being a parent of two active grade school children and husband.

Matthew Edson

The education I received will put me above my competition and has provided me to the tools to helps other meet their personal fitness goals.

Pilar Roberts

When I received the course material it was more in-depth than I expected which was good! I knew I was being provided with all the knowledge I need to become the best trainer I can.

Jessica Moyle

I am so impressed by the level of professionalism and thoroughness that ISSA offers to trainees.

Megan Ganzagan

I have been training this 13-year-old girl and it's been more than 8 to 9 months. Her parents were extremely happy about her body language, and she has improved a lot in endurance/stamina.

Shoeb Iqbal

I needed a online option that would meet my needs so I could study and also work, the course more than met my needs and expectations.

Tim Creasey

The site is very easy to navigate, the content is very educational and flows smoothly, I receive help quickly when I have a question.

Christina Walters

Thank you once again to the staff at ISSA for giving me this opportunity to enroll into your program and making me feel welcome. I can't wait to take you guys on my next fitness journey in life!

Demetri Carter