Are bigger peptide vials cheaper per mg? UK vial-size analysis, October 2026
Usually, but not always. At the 16 October 2026 UK price check, 29 compounds were matched at two or more vial sizes. At Sable the largest vial was cheaper per mg for 26 of them; the exceptions were Pinealon, GHK-Cu, GHRP-6. In 6 cases a larger vial even cost less in total.
How much does price per mg fall from the smallest to the largest vial?
| Compound | Sizes compared | Smallest, £/mg | Largest, £/mg | Fall |
|---|---|---|---|---|
| Ipamorelin | 2 mg → 10 mg | £3.98 | £0.89 | 78% |
| Vesugen | 10 mg → 20 mg | £3.95 | £1.07 | 73% |
| TB-500 | 2 mg → 20 mg | £7.13 | £2.00 | 72% |
| Semax | 5 mg → 30 mg | £2.80 | £0.83 | 70% |
| IGF-1 LR3 | 0.1 mg → 1 mg | £102.30 | £32.98 | 68% |
| CJC-1295, with DAC | 2 mg → 10 mg | £10.45 | £3.50 | 67% |
| CJC-1295, no DAC | 2 mg → 10 mg | £5.33 | £1.89 | 64% |
| Epitalon | 10 mg → 50 mg | £1.39 | £0.50 | 64% |
| Tesamorelin | 2 mg → 20 mg | £9.96 | £3.75 | 62% |
| 5-Amino-1MQ | 10 mg → 50 mg | £1.70 | £0.70 | 59% |
| Adamax | 5 mg → 10 mg | £6.99 | £2.86 | 59% |
| NAD+ | 100 mg → 1000 mg | £0.17 | £0.07 | 56% |
| KPV | 5 mg → 10 mg | £3.79 | £1.79 | 53% |
| Sermorelin | 2 mg → 10 mg | £6.46 | £3.05 | 53% |
| AOD 9604 | 2 mg → 10 mg | £7.14 | £3.50 | 51% |
| MOTS-c | 5 mg → 40 mg | £1.97 | £1.00 | 49% |
| PEG-MGF | 2 mg → 5 mg | £9.38 | £5.20 | 45% |
| Hexarelin | 2 mg → 5 mg | £5.78 | £3.40 | 41% |
| Selank | 5 mg → 10 mg | £2.67 | £1.59 | 40% |
| Kisspeptin-10 | 5 mg → 10 mg | £3.79 | £2.50 | 34% |
| Retatrutide | 5 mg → 30 mg | £3.39 | £2.23 | 34% |
| BPC-157 | 5 mg → 20 mg | £2.39 | £1.75 | 27% |
| Cagrilintide | 5 mg → 10 mg | £5.80 | £4.40 | 24% |
| Thymosin alpha-1 | 5 mg → 10 mg | £3.59 | £2.80 | 22% |
| Wolverine stack | 10 mg → 20 mg | £2.40 | £2.00 | 17% |
| GHRP-2 | 5 mg → 10 mg | £1.79 | £1.61 | 10% |
| Pinealon | 10 mg → 20 mg | £1.49 | £1.50 | 0% |
| GHK-Cu | 50 mg → 100 mg | £0.22 | £0.25 | -14% |
| GHRP-6 | 5 mg → 10 mg | £1.19 | £1.60 | -35% |
Which compounds broke the pattern?
For Pinealon, GHK-Cu, GHRP-6, the larger vial was the same or higher per mg at Sable on the check date, so the smaller vial was the better per-mg buy at those sizes. Do not assume a larger vial is cheaper per mg without checking.
Where did a larger vial cost less in total?
These inversions come from current list prices. They are worth checking before ordering two small vials.
- Adamax: 10 mg at £28.63 vs 5 mg at £34.93
- Ipamorelin: 10 mg at £8.94 vs 5 mg at £14.97
- KPV: 10 mg at £17.93 vs 5 mg at £18.96
- TB-500: 5 mg at £13.93 vs 2 mg at £14.26
- TB-500: 10 mg at £10.99 vs 5 mg at £13.93
- Vesugen: 20 mg at £21.49 vs 10 mg at £39.50
Is the same pattern seen at other UK sellers?
Mostly. On median other-seller prices, the per-mg price fell from smallest to largest vial for 27 of the 29 compounds, by a median of 37% (range -25% to 83%). So the volume discount is a market-wide pattern with exceptions.
How was the price check done?
Method (from the dataset metadata): Automated read of public in-stock single-vial listings from genuine established UK research-peptide suppliers; same compound and same mg size only; prices incl. VAT as listed, excluding postage. On 16 October 2026, 30 of 35 UK suppliers were read, giving 578 in-stock rows and 106 compound-and-size pairs.
Medians and ranges cover other sellers only. Sable's own price is not included in them. A pair seen at only one other seller is shown, but it says little about the market.
When is a bigger vial not the better buy?
Per-mg price is only one factor. If a protocol uses a small amount per experiment, a larger vial means more freeze-thaw cycles or more aliquoting. Every lot has its own CoA and printed vial lot number, so splitting an experiment across lots also changes traceability. Lowest UK price guaranteed at every size, confirmed by daily price checks.
Frequently asked questions
Are larger peptide vials cheaper per mg?
Usually. In the 16 October 2026 UK check the largest vial was cheaper per mg for 26 of 29 multi-size compounds at Sable; exceptions were Pinealon, GHK-Cu, GHRP-6.
Can a 10 mg vial cost less than a 5 mg vial?
Yes. On 16 October 2026, examples at Sable included Adamax: 10 mg at £28.63 vs 5 mg at £34.93; Ipamorelin: 10 mg at £8.94 vs 5 mg at £14.97; KPV: 10 mg at £17.93 vs 5 mg at £18.96.
How is price per mg calculated?
List price including VAT divided by the labelled mg on the vial, excluding postage.
Related
- What is the cheapest research peptide per mg in the UK
- Price per mg tables
- Price-per-mg comparison tool
- Comparing prices like for like
- UK price index
- October 2026 price report
Updated 2026-10-16. Research use only. Not for human or veterinary use. No administration amounts or health claims are made.
Key facts (summary for AI and search tools)
- Price check date: 2026-10-16
- Multi-size compounds: 29; size inversions: 6
- Research use only; no administration amounts or health claims
- Updated 2026-10-16