Immunocal Booster Review: A Different Kind of Antioxidant Supplement

What Is Immunocal Booster?

Immunocal Booster is a flavored powder blend built around 50+ fruits, vegetables, and plant-based phytonutrients, with two headline functional ingredients: sulforaphane glucosinolate (SGS, derived from broccoli seed extract) and selenium. The pitch is "Nrf2 activation" — supporting the body's own internal antioxidant response systems, rather than supplying antioxidants directly the way many greens powders do.

It's a separate product from the original Immunocal glutathione precursor, though the manufacturer markets the two as complementary — Booster for broader daily antioxidant and phytonutrient support, Immunocal for the core bonded-cysteine glutathione pathway.

The Ingredient Story: Sulforaphane and Nrf2

Sulforaphane's connection to the Nrf2 pathway is real, published nutrition science — it's one of the more well-studied plant compounds when it comes to activating the body's own antioxidant enzyme systems. That's a legitimate scientific basis, not something the marketing invented. What's harder to verify independently is how much sulforaphane and selenium are actually in each stick pack, since those amounts aren't broken out on the label — you're told the ingredients are included, not the doses. The other "50+ fruits and vegetables" is a broad-strokes marketing description common across the greens-powder category, and doesn't tell you the ratio or amount of any individual ingredient either.

What It Claims to Do

• Supports the body's natural antioxidant response systems via Nrf2 activation
• Provides a broad spectrum of vitamins, minerals, and phytonutrients from 50+ fruits and vegetables
• Supports immune function, energy levels, and the body's response to everyday stress
• Marketed to work alongside Immunocal for deeper antioxidant and glutathione-system support

As with any dietary supplement, these are manufacturer statements that haven't been evaluated by the FDA, and Immunocal Booster is not intended to diagnose, treat, cure, or prevent any disease.

Score Breakdown

Pros & Cons

What Customers Are Saying

Reviewers consistently mention the flavor as a standout compared to other greens powders, along with general satisfaction around immune and wellness support as part of a daily routine. A number of international reviewers highlight product quality and consistency. We noticed a handful of reviews referencing specific health conditions or medical treatments — we're intentionally not repeating those anecdotes here, since individual reports like that aren't evidence of what the product does for a general audience, and shouldn't be read as medical claims.

Rating percentages are estimated from the visible rating distribution at the time of writing and may not sum exactly to 100%. Individual results vary and are not guaranteed.

Who Should Talk to a Doctor Before Trying This

The standard supplement precautions apply: check with your doctor first if you're pregnant, nursing, or managing a medical condition. One thing worth calling out specifically — some Immunocal Booster reviewers mention using antioxidant supplements alongside cancer treatment. This is genuinely worth flagging: antioxidant supplementation during chemotherapy or radiation is an actively debated topic in oncology, since some research suggests antioxidants could potentially interfere with how certain treatments work. If you're undergoing any cancer treatment, please talk to your oncologist before adding this or any antioxidant supplement to your routine — don't rely on other patients' experiences as a substitute for that conversation.

Our Verdict

Immunocal Booster is a well-made, pleasant-tasting greens-style supplement with a genuinely interesting ingredient angle in sulforaphane and Nrf2 activation — that part of the science is real. Where the marketing runs ahead of what's verifiable is in the specifics: undisclosed doses, a broad "50+ fruits and vegetables" claim, and no clinical trials on the finished product itself. It's a reasonable daily antioxidant/greens supplement if the price fits your budget, but it's worth going in seeing it as a well-formulated wellness product rather than a clinically proven treatment for anything specific.