The headline offer on this page is the free shipping promo at the top of the page, a promo code that gives free delivery on your order from Quicksilver Scientific. Use that code if delivery cost is the main thing you want to avoid, for example on small orders where shipping would otherwise be a meaningful extra.
Low spend and single supplements, If you are buying a single supplement priced from $21, the cheapest clear route is the item price as marked or the sitewide 15% off code. For a $21 supplement, the 15% off code takes 15% off, leaving $17.85 and saving $3.15. Use the 15% off code when the product is not marked in the sale and shipping charges would push your total up; the free shipping code wins only if the shipping fee you would otherwise pay is larger than the 15% saving.
Buying a bundle from $70, Bundles start at $70 and the 15% off code applies to sitewide purchases. On a $70 bundle, 15% off reduces the price to $59.50, a saving of $10.50, so the 15% code is likely the better choice unless the free shipping charge you avoid is more than $10.50. If the bundle is included in the sale at up to 52% off, the sale price as marked may beat either code; sale prices require no code.
Protocols from $133, For a $133 protocol, the 15% off code lowers the total to $113.05, saving $19.95. If a selected protocol is already reduced in the sale, the sale price at up to 52% off may give a larger saving, but sale items vary by product and need no code.
High value items and testing from $460, Testing starts at $460. The 15% off code would reduce $460 to $391, a $69 saving, but many testing or specialist items sit outside sitewide promotions. If a specific test is shown in the up to 52% off sale, the marked sale price often saves more than a 15% code, but sale eligibility is product specific.
Subscriptions, multi buy and bundles, If you are signing up for a subscription, the listed 10% off subscription applies automatically to subscriptions and is separate from the 15% codes. For two or more Back To Routine Essentials, the 10% off when you buy 2 or more applies to those eligible items and cannot be combined with other promotions.
Our records show the 15% codes are the typical percentage promo for Quicksilver Scientific in the 12 months to October 2026, and the biggest percentage code in that period was 15% off. Our team tested six Quicksilver Scientific offers at checkout in the 12 months to October 2026.
Choose the single offer that leaves you the lower total. If a product is marked in the sale, use the sale price. If it is not on sale, compare the 15% code result with the value of free shipping for your order and take the lower total. Where an offer states it cannot be combined, do not try to stack codes.
