iHerb is showing the 22% off Immunity Support voucher at the top of this page, and that code is best when your cart is made up mainly of Immunity Support products. The voucher must be entered at checkout and the terms say it cannot be used with any other offer. Other active options include first order codes (25% new customer and 20% first order), several 20% site codes, brand specific codes and large site sales.
Large baskets over $100. If your order totals $100 or more and contains mixed items, try the 20% off orders over $100 code because it applies sitewide once you meet the $100 minimum. For example, on a $110 cart the code takes 20% off (percent 20%), leaving $88.00, a saving of $22.00 from $110.00. If you are a new customer eligible for the 25% new customer code, that usually saves more on a first purchase (see next scenario).
New customers on a first order. If this is your first purchase, the 25% off for new customers gives the largest single cut on eligible first orders. On a $100 first order the 25% code reduces the price by 25.00, leaving $75.00 and saving $25.00 (percent 25%, final $75.00, saving $25.00). If the 25% code does not cover the items in your cart for any reason, the 20% first order code is the fallback for first timers.
When your cart is mostly Immunity Support products. Use the 22% off voucher at the top of this page. On an $80 order made up of Immunity Support items the voucher takes 22% off (percent 22%), leaving $62.40, a saving of $17.60 from $80.00 (final $62.40, saving $17.60). This beats any 20% site code for those same items because the percentage is higher.
Brand specific or category purchases. If you are buying Doctor's Best products, the 20% Doctor's Best code applies to that brand. If you buy Paradise Herbs and are not in the US, the 15% Paradise Herbs code applies but the terms exclude US customers. Apply the brand specific code only to the items it covers and compare the final price with a sitewide or product specific alternative.
Items already on sale or small carts. Sale prices apply automatically and some sales go up to 75% off. A heavily reduced sale item often costs less than using any percent code on the original price. For example, a $60 item at 60% off costs $24.00, saving $36.00, which can be larger than the saving from a 22% or 25% code on the full price.
When choosing, work out the checkout total for each eligible option and take whichever leaves you paying the least. Many codes state they cannot be combined with other offers, so you will typically use only one code; where a code is restricted to new customers or a specific brand, apply that rule before comparing totals. If a sale price is lower than any coded discount, choose the sale price.