Function Health discount codes
Working promo codes, partner discounts, and card-linked offers — what's live in May 2026 and how to actually apply them.
Function Health doesn't run nearly as many discounts as you'd expect for a direct-to-consumer brand, and the codes that do exist don't stack. So the practical question is: which single code saves you the most? Below is the full set of currently-working discounts I've been able to verify, ordered roughly by how much you save.
All discounts apply to the standard $365/year Function membership. Prices are first-year unless noted.
The working codes (May 2026)
HUBERMAN — $50 off
Effective price: $315 for the first year.
Andrew Huberman is on Function's advisory board, and the HUBERMAN code has been the most consistent public discount since Function launched. It's the best plain-vanilla code currently active, and the one I'd default to if you don't qualify for one of the partner promos below.
EXCELLENCE25 — $25 off
Effective price: $340 for the first year.
A smaller alternative if HUBERMAN ever stops working. Strictly worse than HUBERMAN as long as both are live.
Member referral — typically $25–$50 off
Effective price: $315–$340 for the first year.
Existing Function members can share a personal referral link. The exact discount varies — I've seen $25 and $50 versions in the wild — and the referrer typically gets a credit on their own account too. If you know a Function member, this is worth asking about; if not, HUBERMAN matches the high end.
Sweetgreen loyalty — $50 off
Effective price: $315 for the first year.
Tied to the January 2026 Sweetgreen × Function co-branded menu launch. Sweetgreen loyalty members got a $50-off Function code surfaced inside the Sweetgreen app. Check your Sweetgreen app's offers section — the original launch promo has rotated, but Sweetgreen and Function have kept the partnership live.
Erewhon "World's Healthiest Smoothie" — $25 off
Effective price: $340 for the first year.
Buy the $16 Function × Erewhon smoothie and you get a $25-off Function code on the receipt or in the Erewhon app. Promo runs through February 2027. Only useful if you're already near an Erewhon — but if you are, $16 for a smoothie that nets you $25 off is the closest Function gets to a stackable discount.
Chase Sapphire Reserve — 50% cash back (expired)
Effective price was $182.50 — expired March 31, 2026.
This was the deepest discount Function has run. It wasn't a code — it was a Chase Offers card-linked promotion that posted 50% as a statement credit. Worth knowing about, because Function has surfaced similar offers more than once and they may rotate back. Full breakdown on the dedicated Function × Chase Sapphire Reserve page.
How to apply a code at checkout
On the Function Health checkout page, the promo code field is on the right side of the order summary, below the price breakdown. It's not always expanded by default — look for a "Have a promo code?" link or a "+" icon next to the subtotal. Type the code, click apply, and the discount should appear as a line item.
A few things to know:
- Discounts don't stack. Function only allows one code per order. Pick whichever gives the biggest dollar savings.
- First-year only. All the codes above apply to your first annual membership. Renewals are at the regular $365 rate.
- Codes can quietly expire. If one stops working, the next-best option below it should still be live. Worth retesting before committing.
- Card-linked offers (Chase, Amex, Capital One) are separate. Those trigger automatically when you pay with the linked card; they don't go in the promo code field.
Function's standing discounts are modest. HUBERMAN at $50 off brings the effective price to $315 — still more expensive than Superpower at $199 or Empirical Health at $190, both of which offer comparable biomarker breadth.
The discounts that actually move Function into a competitive price band are the card-linked ones (the Sapphire Reserve 50% cash back was the clearest example). If you don't have one of those triggered, and if cost is the deciding factor, the better question may not be "which Function discount code should I use" but "is Function still the right choice at this price?" See the Function vs Superpower comparison for the side-by-side breakdown.
If you've decided Function is the one and just want the cheapest entry point right now: HUBERMAN at checkout, and check the Chase Offers tab on any Chase cards you carry before you click pay.