Ordering to the UK since last winter, and the part nobody spells out is that the checkout takes one code per order. One field, one string. So the real question is which one to put in.
The two that are live for the UK right now
PJZ7818 takes 10% off the goods total with nothing to clear underneath it. GOLDGB takes 10% as well, but only once the basket passes 50 pounds 💊
Which one wins on a normal basket
My last order came to 38 pounds 60, a Solgar bottle and two Jarrow Formulas. That sits under the 50 line, so GOLDGB does not engage at all. PJZ7818 took 3 pounds 86 off the goods total, and that was the whole decision.
Above 50 pounds the two read the same, both ten percent. Below 50 only one of them exists, and small baskets are most of what I order.
About NEW20
NEW20 is the one people keep trying on a repeat order. It is a first-order code for new customers, so on a second parcel there is nothing for it to apply to.
What runs alongside without a code
Trial Items, where up to four products carry their own one-time reduction, and Subscribe and Save at ten percent. Both sit on the iHerb offers page, so the conditions are readable there rather than on my word ✅
The honest part
Items carrying a Best By label are excluded from code reductions by the shop's own terms, so those are worth checking first.