Articles by Brittany Johnson
First-ever Clinical Study Finds Nutritional Gaps in GLP-1 Users
Brittany Johnson PhD, MS, RDN reviews the clinical study on the nutritional gaps in GLP-1 users. Learn about supplement and diet recommendations.
Best Gut Health Supplements of 2025
Brittany Johnson reviewed the best gut supplements of 2025! Read her picks for the best prebiotics, probiotic and postbiotics to support your digestive health!
HMB: What You Should Know from a Dietitian, PhD
Brittany Johnson, PhD, MS, RDN, CSSD discusses HMB supplements, the benefits and considerations when taking. Learn how HMB can help support muscle and fitness goals!
GNC Protein Clinical Studies: Industry Leading
Brittany Johnson walks you through GNC's long history of protein and performance clinical research studies! Read what we've done since 2002 and what it means for you.
The Flu vs. Strep Throat: Understanding the Differences
In this article, we'll delve into the differences between the strep vs flu, helping you better understand and differentiate these two common fall and winter illnesses.
The Flu: How Long Does It Last and How To Avoid It?
Learn all about the flu including symptoms, treatments, how long it lasts, and holistic ways to support your immune system.
LIT™ Charged – Newest Energy on the Block
Read about the newest energy supplement on the block with on-the-go nootropic ingredients to keep you going anytime, anywhere.
Top 10 Best Supplements for First Responders
Discover GNC's top 10 llist of the best GNC supplments for first responders! Find Brittany's picks for best protein, best multivitanin, best testosterone and more for tactical athletes.
From Lab to Life: Translating Clinical Research to the Real-World
Learn how clinical research is translated to real world application by GNC's Brittany Johnson. Discover exercise science and how supplements are developed.
Best Protein Bars of 2023
Check out our curated list for the best protein bars of 2023 brought to you by our Senior Merchant at GNC Headquarters.
Pumpkin Spice Cold Brew
It’s pumpkin season—what better way to spice up your day than with a pumpkin spice cold brew with added protein!
Caramel Cookie Flavored Smoothie Recipe
Fuel your inner superhero with a caramel cookie flavored high protein smoothie with almond butter and a banana to conquer your day.
Caramel Cookie Flavored No-Bake Protein Bites
Be an everyday hero and fuel up. These bite-sized high protien bite snacks are packed with ingredients to fuel your body, with a tasty caramel cookie flavor!
Tiramisu Overnight Protein Oats
Pack in a high protein tiramisu flavored overnight oat recipe with Beyond Raw's most innovative whey protein on the market.
New! Men’s & Women’s Stress Vitapak® – What’s in it?
Read about GNC's comprehensive supplement pak regimen for stress relief and stress related concerns. Support relaxation and wellness with vitamins and minerals for mind and body.
Best Supplements for Cancer Zodiac Sign
If your Zodiac sign is Cancer, then check out these supplements to support the common traits of the fourth Zodiac sign.
I Tried Creatine for the First Time, and Here’s What Happened
Brittany Johnson PhD, MS, RDN, CSSD, tries creatine supplements for the first time. Read and learn from her creatine loading journey, what she takes, and how she felt!
The Ultimate Guide to Creatine Dosing
Learn about creatine dosing from GNC's expert Brittany Johnson PhD, MS, RDN, CSSD. Read about loading, creatine cycling, when to take, and having carbs with creatine!
Creatine Myth Busting
Read common creatine myths and the facts from GNC's Brittany Johnson PhD, MS, RDN, CSSD. Learn if you have to creatine load, if it's a steriod, and if it's just for men!
Power Up Aging Muscles: The Benefits of Creatine for Older Adults
Read and learn how creatine benefits older adults! Research finds that creatine supports increased strength and muscle mass, as well as fat mass reduction for older adults.