What is the cheapest way to grow supplements in the GCC?

Selling again to somebody who has already bought. It is not a strategy anyone finds exciting and it is the only one where the cost per order falls as you use it.

The cheapest growth is the growth you already paid for

Ranked by cost per incremental order: owned channels first, then referral, then paid. Most budgets run that list backwards, and the reason is usually that paid is the only one with a dashboard.

Winning a customer costs money and selling to them again costs almost nothing, and most budgets are spent as though the reverse were true. For a supplements and health store in the GCC, the answer turns on one thing in particular: Subscription behaviour without a subscription: people finish a tub and reorder, often on the same day of the month.

What is different about the GCC

The GCC is not one market. Payment habits, delivery norms and language expectations differ enough that a single approach underperforms in at least one country.

Payment preference varies by country more than most planning assumes.

What is different about a supplements and health store

Discounting to grow trains people to wait for the discount. It works once.

Where a mobile app comes into it

Reorder reminders are the whole opportunity, and they are free through an app and paid through anything else.