The best offense is a good defense. Here's how to keep your immunity in fighting shape.

Staying healthy takes a multi-pronged approach. It starts with regular exercise, a nutritious diet, adequate sleep, and stress management. Supplements can also help ensure you and your immune system are running at 100 percent when the day comes that you need them to be resilient against the world at large. Never has that been clearer than right now, when sickness is on everyone's mind.

What many immune formulas have in common is their antioxidant properties. Antioxidants are substances that neutralize free radicals to protect cells from damage. In other words, they keep cells healthy so your organs and body systems, including your immune system, can keep working correctly.

Here's the good news: You don't need to buy fancy or expensive supplements to harness antioxidant power. The best supplements for your immune system are pretty basic.

Here's our guide for cold and flu season:

1. Turmeric Curcumin with Black Pepper

Turmeric Curcumin with Black Pepper is one of the most well-known and most popular for it's anti-inflammatory properties, and for good reason. This simple, affordable supplement delivers a big antioxidant hit to protect cells from free radical damage, helping to support a healthy immune system.*

Turmeric Curcumin with Black Pepper is special because it also helps your body produce other things it needs.

2. Fat Burning SuperGreens

Even if you start every morning with a kale smoothie that you could prop up a spoon in, it can be tough to get all the veggies and fruits you need. Consider a well-formulated green powder your vegetable insurance. It gives you more kinds of superfoods than you'd ever eat on the regular, in one easy-to-drink beverage that doesn't taste like your lawn. (Granted, a greens supplement isn't a replacement for actually eating vegetables, since it doesn't have the fiber you get from veggies in their natural state. The supplement's main job is to provide extra nutrients.)

In Fat Burning SuperGreens, you get veggies as well as sprouts, wheat grass, sea vegetables, spirulina—all kinds of stuff that's super good for you but not normally in your grocery cart. And most super of all, it tastes great.  Currently it is Buy One Get One FREE!

3. Max Omega-3

Omega is less famous than Turmeric, but it also provides powerful immune system support, making it another great addition to your supplement regimen.

Max Omega-3 plays a lot of roles in the body. It helps your skeletal, neurological, and endocrine systems work correctly, and helps with protein and carbohydrate metabolism, among many other jobs.*

It's also a key component of EPA and DHA, which helps with muscle recovery and anti-inflammatory.

4. Maximum Slim Multivitamin

A good multivitamin is one supplement everybody should be taking, not just during cold and flu season, but to protect against nutritional deficiencies year-round. It's especially important if you work out a lot, since between the extra wear and tear on your body and losing minerals through sweat, you just need more of everything.

We love this multi formula because it contains premium ingredients like vitamin B12 and folic acid, that are easier for the body to absorb. It also has a blend of natural food-based ingredients to give you even more micronutrients.

Maximum Slim Multi-Vitamin includes full, optimal amounts of each active ingredient. You have to take two of these bad boys a day, but you'll know you're getting a potent dose.