Health Deals Radar — May 21, 2026

iHerb swapped its sitewide code overnight. MAY26SW expired yesterday at 10 a.m. PT and the new replacement, MAY26BC, covers only brain health supplements — a meaningfully narrower category than its predecessor's sitewide wellness scope. The three US-only carry-forward codes are unchanged. Over on Amazon, five Memorial Day health deals went live this week, and three carry-forwards from May 20 that couldn't be re-verified (Orgain, MaryRuth's, Ghost Whey) are no longer listed here. Costco's coupon book is stable through June 7. MyProtein's 35% off Memorial Day sale starts tomorrow.

New deals flagged with 🆕; carry-forwards still active are unmarked; "Memorial Day only" denotes May 25 expiry.

MAY26SW is gone — it expired May 20 at 10:00 a.m. PT. The replacement code is MAY26BC, and the scope change is significant: where MAY26SW covered all wellness products at 15% off (or 20% off $100+), MAY26BC is brain health supplements only at a flat 15% off. 1 MAY26BC was posted May 20 by u/Horror_Shirt5260 on r/iHerbpromocode_ (an iHerb community for sharing promo codes) and expires May 27, 2026 at 10:00 a.m. PT.

If your cart is stocked with brain health items — lion's mane, nootropics, omega-3, bacopa — MAY26BC applies. For everything else (protein, general vitamins, beauty supplements), the three US-only codes below give better or equivalent coverage.

These three codes are unchanged from yesterday and remain the primary discount mechanism for general iHerb shopping. 23

*22WELLNESS22's expiry date has not been confirmed — verify it still applies at checkout.

For carts over $60, MAYWELLNESS is the top pick at 22% off with two uses per account. For smaller orders, MBDAILY (20% off, no minimum, one-time) is the only current US code with no floor. MAY26BC stacks on top of any of these if your cart qualifies for the brain health category — enter a referral code first, then apply the promo code.

Five new deals went live this week across supplements and fitness equipment. Three May 20 carry-forwards (Orgain Organic Protein, MaryRuth's MROPHILSMY, Ghost Whey) could not be re-verified in this window and have been removed from the list.

Naturebell Pure Magnesium Glycinate 240-ct (500 mg per capsule) is 41% off at $15.96 on Amazon. 4 At 500 mg per capsule and 240 capsules, a single bottle lasts roughly 8 months at 1 capsule per day. Everyday Health's editorial team notes the glycinate form does not carry the laxative side effect common to magnesium oxide, making it the preferred form for sleep and general deficiency supplementation.

Garden of Life Grass Fed Collagen Peptides (unflavored) is 30% off at $32.89. 4 The product dissolves in coffee, tea, or smoothies and sold to more than 20,000 Amazon buyers in the past month.

Physician's Choice Fiber Gummies for GLP-1 Support (raspberry lemon, 60 count) is 32% off at $13.56; Subscribe & Save brings it to 40% off. 4 Formulated for people on GLP-1 medications (such as semaglutide), each serving delivers more fiber than seven cups of raw spinach via chicory root fiber and pectin.

NeoSilent Walking Pad is 70% off on Amazon, included in Everyday Health's editors' picks. 4 The source does not list an original price or final sale price; verify the current price directly on the product page before ordering.

Eu Natural Urinary Harmony (D-Mannose & Hibiscus Supplements, 60 capsules) is 20% off at $59.99 — for Memorial Day (May 25) only. 4 The formulation is vegan-certified, containing D-mannose (a naturally occurring sugar) and hibiscus extract for urinary tract support.

Lunakai Magnesium Glycinate 90-ct (120 mg elemental magnesium + Vitamin B6 per capsule) remains at approximately $9.96 shipped after stacking a 40% digital coupon (clip on the product page) with 10% Subscribe & Save, down from a regular $19.91. 5 Choosing 15% S&S instead drops it to roughly $8.96. Clip the coupon before adding to cart — coupon availability can change.

YOSUDA Magnetic Rowing Machine (16 resistance levels, Bluetooth app support, 350 lb capacity) is listed at $190 via a third-party seller on Amazon, 20% off the regular $238. 6 Amazon's own stock is out. Verify the third-party listing is still active before purchasing.

Pricing note: CamelCamelCamel historical pricing data was not available for the five new Memorial Day deals this cycle. No all-time-low comparisons can be made for these products until that data is retrieved.

All six health-related deals in the Costco May 2026 Instant Savings Book (valid May 11–June 7) are confirmed active and unchanged from previous runs. 78 No coupon code needed — discounts apply automatically at the register for Costco members.

The Oikos Triple Zero deal remains the most protein-efficient item in the book: 15g protein per 5.3 oz cup, zero added sugar (stevia-sweetened), and no fat, across 18 cups per Costco pack. Nature Valley Protein Bars check in at 10g protein and 6g fiber per bar, with no high fructose corn syrup or artificial flavors, gluten-free. 8

Community find — Humm Kombucha 8-pack clearance, $4.97 (Midwest, YMMV): Reddit user u/swifthandsam spotted Humm Kombucha (a probiotic fermented tea brand) on clearance for $4.97 in a Midwest Costco on May 20. 9 The $0.97 ending confirms Costco clearance pricing. The post earned 147 upvotes and 49 comments with multiple users confirming the deal at their own locations. Clearance inventory is regional — check the tag in your warehouse before counting on it.

Costco closes on Memorial Day (May 25). The coupon book deals remain valid through June 7, so no need to rush before the holiday.

SELECTBRON gives 20% off all Dr. Bronner's products at Vitacost (a Kroger-owned online natural products retailer) through May 25 at 7:00 a.m. ET — that's Sunday morning. 10 Vitacost's product pages carry the banner: "Save 20% off Code SELECTBRON Ends: 5/25/26 at 7:00 a.m. ET."

Dr. Bronner's (an organic personal care brand known for multi-use castile soaps, body lotions, and lip balms) stocks items priced for bulk — a 32 oz castile soap bottle typically runs $16–$20 at list price. At 20% off, it drops to roughly $13–$16. Three days left on this window.

MyProtein (a UK-based sports nutrition brand owned by The Hut Group, primarily known for Impact Whey Protein and creatine products) has a 35% off Memorial Day sale confirmed to start May 22. 1112 The May 22 start date appears across multiple Instagram posts and coupon aggregators.

As of today, us.myprotein.com shows no Memorial Day-specific terms, sale banner, or promo code requirement. 13 Key unknowns: whether the discount is automatic or code-dependent, which products are excluded, and how long the sale runs. Check the MyProtein US homepage on May 22 for the live terms before ordering.

iHerb two-code stack: iHerb accepts a referral code in the referral field plus one promo code. Enter the referral code first, then the promo code. Active referral code options: DVO4205 (long-standing; recommended by u/honeyjalapenos on r/iherbcodeshare), KOD6351 (posted May 20 by u/beachbow; claimed to add free shipping with MAYWELLNESS), DQL3272 (used by u/Horror_Shirt5260 with MAY26BC). 2 Referral credits land in your iHerb account for a future order, not as a direct cart discount.

Amazon S&S stacking: Lunakai Magnesium and Physician's Choice Fiber Gummies both layer a clip coupon on top of Subscribe & Save. For Lunakai, the sequence is: (1) clip the 40% coupon on the product page, (2) select Subscribe & Save at checkout for an additional 10–15% off. Cancel the subscription after the first order if you prefer not to autoship.

Vitacost window closes Sunday: SELECTBRON expires May 25 at 7 a.m. ET — three full days remain but that's a real deadline, not an estimate.