What the numbers say
On an order at $37.95, a travel-size bottle costs $5.72: its unit cost and one more pick. The customer pays the same, so the order's margin falls from $11.69 to $5.97.
To earn the same per visitor, the gift has to bring 95.8% more buyers. A cheaper gift, or a gift on larger orders only, needs less.
The gift's retail value ($15.00) is what the customer sees; its cost is what the margin pays. A half-size bottle, costed at half the full bottle's unit cost.
Nature's Sunshine's Subscribe & Thrive takes 25% off every subscription order and ships it free. Nature's Sunshine, Subscribe & Thrive, read 23 September 2026
The cost structure, and where it comes from
| Price | $37.95, a bottle of supplements. Nature's Sunshine homepage, read 23 September 2026 |
|---|---|
| Unit cost | $10.47. From the reported gross margin: “Gross margin in 2025 increased to 72.4% compared to 71.5% in 2024.” Nature's Sunshine, fourth quarter and full year 2025 results, read 23 September 2026 |
| Pick and pack | $3.20 per order and $0.48 for each extra item. Fulfill.com, 3PL pricing benchmarks (The Fulfillment Advisor 2025 survey of 600+ warehouses), read 23 September 2026 |
| Shipping label | USPS Ground Advantage, commercial, Zone 5, by weight rounded up to the pound: 1 lb $9.29 · 2 lb $10.50 · 3 lb $12.12 · 4 lb $13.89 · 5 lb $14.53. Packed weight is an assumption: 0.5 lb per unit. USPS Notice 123, USPS Ground Advantage Commercial, Zone 5 (effective 4 October 2026), read 13 October 2026 |
| Card fees | 2.9% + $0.30 per order: Shopify Payments' online rate for a standard card on the Basic plan in the United States. Higher plans pay a lower rate, and premium cards a higher one. Shopify's pricing page for the United States, online standard card rates, read 12 October 2026 Rates by plan and country |
| Refund reserve | 5%, Offer Suite's default assumption for consumables. NRF's all-category figure for online sales is 19.3%, but consumables are rarely returned; use your own rate. |
| Gift | A travel-size bottle: unit cost $5.24, retail $15.00. A half-size bottle, costed at half the full bottle's unit cost. |
The offer, as an agent writes it
An agent writes this offer as one document for Offer Suite's API, validated against the offer schema. Below is one option of it: what the buyer gets and the price it promises. Offer Suite checks with a real cart that checkout charges exactly the prices above.
Show one option 1 option · excerpt
{
"key": "with-gift",
"display": {
"title": "With a travel-size bottle"
},
"lines": [
{
"role": "main",
"quantity": 1,
"purchase": {
"type": "one_time"
}
},
{
"role": "gift",
"quantity": 1,
"purchase": {
"type": "one_time"
}
}
],
"pricing": {
"promise": {
"firstChargeCents": 3795,
"renewalChargeCents": null
}
}
}How Offer Suite validates, versions and publishes a document like this one: offer documents.
Questions
Is a gift with purchase profitable for supplement brands?
With a travel-size bottle, an order at $37.95 keeps $5.97 on these costs, $5.72 less than without it. It is profitable while the order still earns, and worth giving only if it brings buyers.
How much does a free gift have to lift conversion for supplement brands?
By 95.8% here, to earn the same per visitor as the order without it.