Thorne Immune Activator

You wrap up your biggest training week of the block, and two days later you're reaching for tissues instead of your running shoes. That timing isn't a coincidence: your gut houses a large share of your immune defenses, and heavy training strains that system long before you ever feel sick. 

Thorne's Immune Activator is built to strengthen the body's natural defense through that gut-immune connection directly, pairing a prebiotic fiber with a polyphenol blend that keeps your body's defenses primed through demanding training blocks.

Feeds the bacteria that support your defenses – Benicaros, a prebiotic fiber made from upcycled carrot fiber, gives beneficial gut bacteria the fuel they need to multiply and crowd out the strains that drag your immune system down during hard training weeks.

Sharpens your immune response – MitoHeal, a polyphenol blend from redcurrant and blackcurrant extract, boosts the immune cell messengers your body relies on to detect and respond to daily stress faster.

Fits into a stack you're probably already running – One capsule a day slots in next to your vitamin C and zinc without adding another dosing decision to your morning routine.

The gut holds a large share of your immune system, and when training stress disrupts that environment, your defenses weaken well before symptoms show up. Benicaros works as a targeted prebiotic, feeding specific bacteria strains linked to a resilient microbiome rather than acting as a generic fiber source. MitoHeal, drawn from redcurrant and blackcurrant extract, supplies polyphenols that help activate the signaling molecules your immune cells use to communicate and respond. Together they support immune function starting in the gut instead of only reacting once you already feel run down.

How to Use Immune Activator

Dose: Take 1 capsule daily with food.

Training block timing: Start 2 to 3 weeks before your highest-volume weeks or race week, since gut-microbiome shifts build gradually rather than kicking in overnight.

Travel and race week: Keep taking it through travel and race day, when disrupted sleep and new environments add extra stress to your immune system.