Updated Saturday, October 31, 2026.
Here’s the latest Halloween weekend roundup from vendor announcements. Several offers changed overnight, and a few now continue into Sunday or next week.
The biggest updates: Instant has a new buy-2-get-3-free offer for Saturday,
Southern Aminos increased its discount, Voltera extended through Sunday night, and
OmegAmino added a qualifying-order gift bundle.
Times below use the timezone supplied by each vendor. Where a vendor did not provide a timezone or exact cutoff, that is noted. Check the final cart total and eligible items before placing an order.
Ending Saturday, October 31
Instant Peptides — new Saturday offer
Buy 2, get 3 free on eligible research peptide vials.
Add all five eligible vials to your cart.
Mix products and strengths, or choose matching vials.
The three lowest-priced eligible vials become free automatically.
No coupon is required for the promotion.
There are separate buy-one-get-one-free offers on lab supplies, vial cases, capsules, raw powders, and sprays. For those offers, add two of the same item.
Ends tonight at midnight Eastern.
Our code PEPTIDECRITIC takes 10% off, but the vendor has not confirmed it stacks with today’s promotion. Check the cart before counting on that additional discount.
Alpha Peptides — tiered Halloween discount
Use BOO:
$150+ cart: 15% off.
$250+ cart: 20% off.
$350+ cart: 25% off.
One code per order. Ends October 31 at 11:59 p.m. Eastern.
Synthesis Peptides
Buy one, get one free with 2x1.
Add two products and apply the code. Cannot combine with other promotions or discounts.
Advertised through October 31; exact closing time and timezone were not supplied.
Mile High Compounds
Buy two, get one free on eligible vials and capsules, with mix-and-match allowed. The lowest-priced eligible item becomes free automatically.
Our code PeptideCritic adds another 10%.
All MHC-3 RT sizes, solvents, and sprays are excluded. Bulk pricing does not apply to sale items, and the first-order promotion is paused.
Ends October 31 at 11:59 p.m. Mountain Daylight Time.
Molecular Solutions Peptides
Use HAUNT20 for the corrected spending tiers:
$250+: 10% off.
$350+: 15% off.
$450+: 20% off.
Login is required to view products.
Ends October 31 at 11:59 p.m.; timezone not specified.
Forge Performance Co.
10% off compounds automatically. Our code peptidecritic stacks, and Zelle payments receive an additional 3%.
Card payments are currently paused; the vendor lists Zelle and Cash App as available.
Ends October 31 at 11:59 p.m. Central.
Paramount Peptides
20% off sitewide with SPOOKY20, on top of the vendor’s reduced base prices.
Ends October 31 at 11:59 p.m.; timezone not specified.
IRON Peptides
31% off sitewide with HALLOWEEN. No minimum spend.
The latest email confirms the offer ends Saturday at midnight. Timezone not specified.
Simms Research
30% off sitewide with TREATS30.
Cannot combine with another coupon. Free FedEx 2-Day shipping is advertised on orders of $200 or more after the discount.
Ends October 31 at 11:59 p.m. Pacific.
Crush Research
Mix-and-match pack discounts:
Three-pack: 20% off.
Five-pack: 25% off.
Ten-pack: 30% off.
Use CRUSHMAIL for an additional 10%.
Ends October 31 at midnight Mountain time. Product availability varies.
NexPept — Canada only
15% off with HALLOWEEN.
The vendor advertises combined savings with mix-and-match quantities:
Three vials: 20%.
Five vials: 25%.
Ten vials: 35%.
Canada-only shipping. Ends Halloween night at midnight; timezone not specified.
ION Peptide
Anniversary promotion advertising up to 45% off sitewide through October 31, plus rotating flash deals.
Flash offers are limited to one unit per customer per flash-sale item and are subject to availability. Check the current selections; Friday’s featured items should not be assumed to carry over into Saturday.
Ends early Sunday, November 1
IDUN Peptides — buy two matching packs, get one free
Buy two matching eligible packs and receive a third identical pack free.
Add two paid packs of the same product, mass, and pack size. The free pack is added automatically. Individual vials, five-vial half kits, and ten-vial kits qualify on eligible products.
The expanded Halloween selection includes KLOW 80 mg, IDN-31 50 mg, MOTS-c 10 mg, IDN-Tesa 10 mg, and IDN-TZ 30 mg.
No additional coupon discounts. Store credit is accepted. Free shipping is advertised on every order.
Ends November 1 at 4 a.m. Eastern.
️ Continuing through Sunday, November 1
Voltera Sciences — extended
The sale has been extended through Sunday, November 1, at 11:59 p.m. Pacific.
35% off automatically.
Additional 10% with our code peptidecritic.
Additional 5% for eligible Zelle, Venmo, or Cash App payments.
Bacteriostatic water is excluded.
BioEdge Research Labs
Buy two, get one free, plus an additional 15% with BOGO15 or our code peptidecritic.
Add three eligible items to your cart. The lowest-priced item becomes free automatically, then apply the eligible discount code.
Peptides, blends, bioregulators, and capsules qualify. Bac Water and AA Water are excluded.
Ends November 1 at 11:59 p.m. Eastern.
Genpeptide
40% off all peptides with PEPTIDECRITIC40.
Advertised through November 1. Exact closing time and timezone were not supplied.
Nura Peptide
40% off sitewide automatically, plus double loyalty points.
Coupon discounts cannot stack with the sale.
Ends November 1 at 11:59 p.m. Eastern Standard Time.
BioLongevity Labs
40% off most products automatically, with no code or minimum spend.
Klotho, FLGR242, Cell Factors, and Apileen13XR receive 20% off instead.
Runs through Sunday night, November 1. The vendor describes the cutoff as midnight Pacific Standard Time.
Puratek
31% off automatically.
Orders of $250 or more after the discount qualify for a free 30 mL BAC water.
Ends November 1 at 11:59 p.m.; timezone not specified.
Studz
Use SPOOKY for the Halloween spending tiers:
Below $200: 15% off.
$200+: 20% off.
$550+: 25% off.
$2,000+: 30% off.
The Halloween discount does not stack with our regular 10% code peptidecritic.
Advertised October 30–November 1. Exact closing time and timezone were not supplied.
️ Continuing into next week
Alpha Peptides — separate GLP-3 RT offer
15% off GLP-3 RT with EARLY15.
The creative says the offer ends Tuesday, November 3, at midnight; timezone not specified. This is a separate offer from the Halloween BOO promotion.
Atomik Labz
Peptide 3(R)/RETA is buy one, get two free. Add one eligible item and the promotion applies automatically.
COSTUME gives 30% off other eligible products. It does not apply to B1G2 or BOGO products.
Peptides 1(S), 2(T), TR, and CS remain BOGO. The vendor also advertises an additional automatic 10% crypto-payment discount.
Ends Thursday, November 5, at 3 p.m. Eastern.
Glow Aminos and Flawless Compounds
Both vendors advertise:
35% off sitewide.
Additional 15% with our code peptidecritic.
Additional 5% for Zelle.
Triple loyalty points.
The offer runs October 28–November 6. Exact closing time and timezone were not supplied. Loyalty points are future rewards, separate from the checkout discounts.
Additional current announcements with less precise deadlines
Southern Aminos — increased Halloween offer
The newest announcement replaces the earlier Haunted Vault details with 45% off sitewide plus 15% with our code peptidecritic.
The email describes a 48-hour promotion beginning October 30 and ending “November 1 at midnight,” without a timezone. Because that wording does not clearly establish Sunday-night availability, check this offer today and confirm the live cutoff.
Labsourced
Buy one, get one free on eligible promotional products, plus an additional 10% with BOO10.
The vendor also advertises volume discounts:
Three bottles: 3%.
Five bottles: 5%.
Ten bottles: 10%.
The vendor says the BOGO, coupon, and volume offers stack. Today’s Halloween email reconfirms the promotion, but does not provide an exact expiration.