Growth Guys promo code, verified October 11, 2026: HEALTHYLIFE10 takes 10% off sitewide at Growth Guys (growthguys.com) on any payment method, and it is the code behind the largest total discount available there today — 30% off when the order is paid with Bitcoin, which the store discounts a further 20% automatically, so a $430.00 CAD cart paid $301.00 CAD. The measured cart, line by line.
We are an affiliate: if you order from Growth Guys using this code we earn a commission, at no extra cost to you. We are not Growth Guys and have no ownership of or role in the company.
Two percentage discounts usually do not add: the second is normally taken from what the first left, so 7% and 11% come to 17.23% rather than 18%. The exception is a store that computes both against the original subtotal as separate lines, where they do add — which is observable on the order itself.
When two percentage reductions apply to one order, the second is calculated against what the first left behind, not against the original price. Ten percent and twenty percent do not make thirty. They make twenty-eight, because the twenty is taken from ninety.
On the cart we read for this: $430.00 CAD subtotal. The code removes $43.00 CAD. The payment-method reduction then removes $86.00 CAD — calculated against the remainder, not the original — for $129.00 CAD off in total and $301.00 CAD to pay. That is 30%, not 30%.
For three days in September this site stated the combined figure as the sum of the two rates. It was wrong, it overstated the saving, and it is logged with its dates on the corrections page. A page that explains compounding while having once got it wrong should say so, because the correction is the evidence that the corrections process is real.
The same arithmetic governs a code stacked on a storewide sale. The sale price becomes the base, and the code comes off that — so the combined figure is always below the sum of the two rates, on every cart, without exception.
A storewide sale and a code behave identically to two stacked percentages: the sale price becomes the base, and the code comes off that. So a 15% sale plus a 10% code is 23.5% off list, not 25%. This matters more than the Bitcoin case because sales are common and the overstatement is the kind a reader can verify in thirty seconds, which makes a page that gets it wrong easy to disbelieve on everything else.
Take a $400.00 subtotal with a seven percent code and an eleven percent reduction. Applied in sequence, the code takes $28.00 and leaves $372.00; the second reduction takes 11% of that $372.00, or $40.92. Total removed: $68.92, which is 17.23% of the original rather than the 18% that adding the percentages predicts — a difference of $3.08 on one order. The gap is small in isolation, grows with the basket, and always runs the same way: the sum of the percentages overstates the saving. That is the default, and it is why the arithmetic is worth checking rather than assuming.
Two reductions add rather than compound only when both are calculated against the same original figure. That happens when a store applies both to the pre-discount subtotal as separate line items, which is a deliberate configuration rather than the default. It is observable on a finished order, and a finished order is the authority here — a cart preview can display the compounded figure before the payment method settles and still be charged the additive one. A worked case: a $169.50 order with a ten percent code and a twenty percent payment reduction was discounted $50.85, and each line item was reduced by exactly 30.00% of its own full price — $67.80 less $20.34, $101.70 less $30.51. Both lines were their stated percentage of the original, so they added. It is observable: if both lines are exactly their stated percentage of the original subtotal, they added; if the second is a percentage of what was left, they compounded. We have seen the same vendor change from one behaviour to the other within three weeks, which is why this is measured each day rather than assumed from the terms.
Adding percentages always overstates the saving, never understates it, because the second reduction is applied to a smaller base than the first. That one-directional bias is what makes it worth knowing: an honest mistake in this arithmetic consistently flatters the offer. When a page quotes a combined figure that is exactly the sum of its parts, that is the signal to check it on a cart rather than to be impressed by it. The gap is small on one order and systematic across every comparison you make.
The claims on this page about two reductions do not add, and the difference is real money can be checked against sources outside this site:
Growth Guys promo code HEALTHYLIFE10: 10% off sitewide at growthguys.com, no minimum purchase and no product exclusions — last verified at checkout October 11, 2026, $4.00 CAD off a $40.00 CAD cart.
See the HEALTHYLIFE10 cart reading for October 11, 2026. Every daily test, back to the first on record, is kept in the HEALTHYLIFE10 dated cart archive.