Your immune system is your body’s personal defensive line (it’s football season, can you tell?) – and it works 24/7 to protect you from viruses, bacteria, and other potential invaders and pathogens. Whether you’re heading into close quarters during the cold winter months, have a child in daycare (IYKYK), or just want to stay resilient year-round – the right supplements can give your immune system a powerful edge.
Here’s a roundup of some of the best immune support supplements available from GNC, and some of this Dietitian’s top picks to keep you feeling your best.
But not all immune supplements are created equal. We focused on the ones back by science. Our picks include ingredients with strong clinical support (like Vitamin C, zinc, and Vitamin D) and formulas that deliver effective doses, not just trendy labels. We also looked at bioavailability (how well your body absorbs it), ingredient quality, and consumer trust.
Ready to give your immune system the support it deserves? Here’s a roundup of some of the best immune support supplements available from GNC, and some of this Dietitian’s top picks to keep you feeling your best.
Best Immune Supplements of 2025
Best Vitamin C for Immune Suport
Think of vitamin C as your immune system’s spark plug. It energizes white blood cells, it shields it from stress and helps you bounce back faster when your immune system is down. And this one is timed-release, for all-day immune support. Bonus: it also supports glowing skin and collagen production!
Best Vitamin D
Even when the sun’s hiding, Vitamin D keeps your immune system glowing. It helps regulate immune response, supports respiratory health, and may even boost your mood during gloomy seasons (more research to come)!
Best Echinacea Immune Support Supplement
This vibrant purple flower is more than pretty – it’s a botanical powerhouse that helps boost our body’s natural resistance. Perfect for when you feel something coming on.
Best Turkey Tail Mushroom Supplement
This colorful mushroom is rich in compounds that fuel your gut microbiome – where 70% of your immune systems lives (woah). It’s like giving your body a daily dose of resilience from the inside out. And unlike other turkey tail products, FRESHCAP is made from 100% whole fruiting body and hot water-extracted for potency.
Best Zinc Supplement for Immune Health
Zinc is your immune system’s translator – it helps cells talk to each other and respond quickly to invaders, support natural resistance. It’s also known to help shorten the length of a cold when taken early on. Zinc lozenges are also popular for seasonal defense.
Best Selenium Supplement
This trace mineral works behind the scenes to boost antioxidant defenses and support immune balance. It’s especially helpful for cellular repair.
Best Vitamin B6 for Immune Support
B6 powers up your immune cells and helps your body produce antibodies. It also supports brain and function, plus energy metabolism – to help you feel sharp and strong, even when your defense is down.
Best Oil of Oregano Supplement
Packed with natural compounds, oregano oil is a fierce defender that supports general wellbeing. It’s your go-to for seasonal support! Easy and convenient, take this dropper on the go and place under the tongue or mix into your favorite beverage.
Best Colostrum Powder Supplement
Derived from bovine milk, colostrum is rich in immune-boosting antibodies and growth factors. It helps strengthen your gut lining and supports overall immune resilience – especially during stress or travel. This unflavored powder can be placed directly into your mouth or mixed into your favorite beverage.
Best Colostrum Capsule
All the benefits of colostrum powder, packed into a convenient capsule. Great for daily use to support gut health, immune defense, and recovery.
Best Liver Health & Detox Support Supplements:
Designed to support the liver’s natural cleansing & detoxifying processes, GNC’s Preventative Nutrition formula provides enzyme balance and antioxidant protection. Plus, it’s scientifically formulated.
This unique liquid formula delivers liver-loving nutrients like milk thistle and choline in a fast-absorbing format. Ideal for those looking for cutting-edge science combined with ancient herbs to improve liver functions, support detoxification, and improve overall wellbeing.
Your immune system and liver are constantly working to protect, restore, and balance. These supplements offer targeted support to help you stay energized, resilient, and ready for whatever life throws your way.
