Vendor comparison
Catalyst Peptides vs Peptide Science Now
Catalyst Peptides is cheaper per mg on 26 of the 40 peptides they share; Peptide Science Now on 11, the same price on 3.
Across all 40, Catalyst Peptides’s price per mg is a median 18% lower than Peptide Science Now’s.
- Listings on the index
- 55
- Cheaper per mg on
- 26 of 40 shared
- Certificates of analysis on file
- none yet
- Ships from
- not stated
- Latest price check
- 21 Oct 2026
- Listings on the index
- 69
- Cheaper per mg on
- 11 of 40 shared
- Certificates of analysis on file
- none yet
- Ships from
- United States
- Latest price check
- 30 Oct 2026
Retail 40
Purchases of fewer than 10 vials.
- AICAR
Catalyst Peptides
$1.12/mg
50 mg · $56.00
checked 21 Oct 2026
Peptide Science Now
$1.00/mg
50 mg · $50.00
checked 30 Oct 2026
Peptide Science Now 11% cheaper
- AOD-9604
Catalyst Peptides
$9.60/mg
10 mg · $96.00
checked 21 Oct 2026
Peptide Science Now
$10.83/mg
6 mg · $65.00
checked 30 Oct 2026
Catalyst Peptides 11% cheaper
- ARA-290
Catalyst Peptides
$5.90/mg
10 mg · $59.00
checked 21 Oct 2026
Peptide Science Now
$4.69/mg
16 mg · $75.00
checked 30 Oct 2026
Peptide Science Now 21% cheaper
- BPC-157
Catalyst Peptides
$5.40/mg
10 mg · $54.00
checked 21 Oct 2026
Peptide Science Now
$9.33/mg
15 mg · $140.00
checked 30 Oct 2026
Catalyst Peptides 42% cheaper
- Cagrilintide
Catalyst Peptides
$12.60/mg
10 mg · $126.00
checked 21 Oct 2026
Peptide Science Now
$14.50/mg
10 mg · $145.00
checked 30 Oct 2026
Catalyst Peptides 13% cheaper
- DSIP
Catalyst Peptides
$5.20/mg
10 mg · $52.00
checked 21 Oct 2026
Peptide Science Now
$10.00/mg
5 mg · $50.00
checked 30 Oct 2026
Catalyst Peptides 48% cheaper
- Epithalon
Catalyst Peptides
$3.15/mg
10 mg · $31.50
checked 21 Oct 2026
Peptide Science Now
$3.80/mg
50 mg · $190.00
checked 30 Oct 2026
Catalyst Peptides 17% cheaper
- FOXO4-DRI
Catalyst Peptides
$31.50/mg
10 mg · $315.00
checked 21 Oct 2026
Peptide Science Now
$25.00/mg
10 mg · $250.00
checked 30 Oct 2026
Peptide Science Now 21% cheaper
- GHK-Cu
Catalyst Peptides
$0.700/mg
100 mg · $70.00
checked 21 Oct 2026
Peptide Science Now
$1.40/mg
50 mg · $70.00
checked 30 Oct 2026
Catalyst Peptides 50% cheaper
- GHRP-2
Catalyst Peptides
$5.00/mg
10 mg · $50.00
checked 21 Oct 2026
Peptide Science Now
$5.00/mg
10 mg · $50.00
checked 30 Oct 2026
Same price
- GHRP-6
Catalyst Peptides
$5.00/mg
10 mg · $50.00
checked 21 Oct 2026
Peptide Science Now
$5.00/mg
10 mg · $50.00
checked 30 Oct 2026
Same price
- Glutathione
Catalyst Peptides
$0.051/mg
1500 mg · $77.00
checked 21 Oct 2026
Peptide Science Now
$0.142/mg
600 mg · $85.00
checked 30 Oct 2026
Catalyst Peptides 64% cheaper
- Hexarelin
Catalyst Peptides
$13.00/mg
5 mg · $65.00
checked 21 Oct 2026
Peptide Science Now
$9.00/mg
5 mg · $45.00
checked 30 Oct 2026
Peptide Science Now 31% cheaper
- IGF-1 LR3
Catalyst Peptides
$75.00/mg
1 mg · $75.00
checked 21 Oct 2026
Peptide Science Now
$110.00/mg
1 mg · $110.00
checked 30 Oct 2026
Catalyst Peptides 32% cheaper
- Ipamorelin
Catalyst Peptides
$5.60/mg
10 mg · $56.00
checked 21 Oct 2026
Peptide Science Now
$8.00/mg
10 mg · $80.00
checked 30 Oct 2026
Catalyst Peptides 30% cheaper
- Kisspeptin
Catalyst Peptides
$5.25/mg
10 mg · $52.50
checked 21 Oct 2026
Peptide Science Now
$13.00/mg
5 mg · $65.00
checked 30 Oct 2026
Catalyst Peptides 60% cheaper
- KPV
Catalyst Peptides
$4.50/mg
10 mg · $45.00
checked 21 Oct 2026
Peptide Science Now
$11.00/mg
5 mg · $55.00
checked 30 Oct 2026
Catalyst Peptides 59% cheaper
- LL-37
Catalyst Peptides
$11.40/mg
5 mg · $57.00
checked 21 Oct 2026
Peptide Science Now
$19.00/mg
5 mg · $95.00
checked 30 Oct 2026
Catalyst Peptides 40% cheaper
- Melanotan 1
Catalyst Peptides
$4.50/mg
10 mg · $45.00
checked 21 Oct 2026
Peptide Science Now
$5.50/mg
10 mg · $55.00
checked 30 Oct 2026
Catalyst Peptides 18% cheaper
- MGF
Catalyst Peptides
$25.00/mg
2 mg · $50.00
checked 21 Oct 2026
Peptide Science Now
$27.00/mg
5 mg · $135.00
checked 30 Oct 2026
Catalyst Peptides 7% cheaper
- MOTS-C
Catalyst Peptides
$4.20/mg
10 mg · $42.00
checked 21 Oct 2026
Peptide Science Now
$11.00/mg
10 mg · $110.00
checked 30 Oct 2026
Catalyst Peptides 62% cheaper
- NAD+
Catalyst Peptides
$0.087/mg
1000 mg · $87.50
checked 21 Oct 2026
Peptide Science Now
$0.400/mg
750 mg · $300.00
checked 30 Oct 2026
Catalyst Peptides 78% cheaper
- Oxytocin
Catalyst Peptides
$4.50/mg
10 mg · $45.00
checked 21 Oct 2026
Peptide Science Now
$6.50/mg
10 mg · $65.00
checked 30 Oct 2026
Catalyst Peptides 31% cheaper
- P21
Catalyst Peptides
$29.90/mg
10 mg · $299.00
checked 21 Oct 2026
Peptide Science Now
$24.00/mg
5 mg · $120.00
checked 30 Oct 2026
Peptide Science Now 20% cheaper
- PEG-MGF
Catalyst Peptides
$24.00/mg
2 mg · $48.00
checked 21 Oct 2026
Peptide Science Now
$19.00/mg
5 mg · $95.00
checked 30 Oct 2026
Peptide Science Now 21% cheaper
- Pinealon
Catalyst Peptides
$6.50/mg
10 mg · $65.00
checked 21 Oct 2026
Peptide Science Now
$3.75/mg
20 mg · $75.00
checked 30 Oct 2026
Peptide Science Now 42% cheaper
- PNC-27
Catalyst Peptides
$7.20/mg
10 mg · $72.00
checked 21 Oct 2026
Peptide Science Now
$30.00/mg
5 mg · $150.00
checked 30 Oct 2026
Catalyst Peptides 76% cheaper
- Retatrutide
Catalyst Peptides
$10.00/mg
30 mg · $300.00
checked 21 Oct 2026
Peptide Science Now
$15.83/mg
12 mg · $190.00
checked 30 Oct 2026
Catalyst Peptides 37% cheaper
- Selank
Catalyst Peptides
$4.20/mg
10 mg · $42.00
checked 21 Oct 2026
Peptide Science Now
$5.50/mg
10 mg · $55.00
checked 30 Oct 2026
Catalyst Peptides 24% cheaper
- Semaglutide
Catalyst Peptides
$7.13/mg
20 mg · $142.50
checked 21 Oct 2026
Peptide Science Now
$22.50/mg
10 mg · $225.00
checked 30 Oct 2026
Catalyst Peptides 68% cheaper
- Semax
Catalyst Peptides
$4.20/mg
10 mg · $42.00
checked 21 Oct 2026
Peptide Science Now
$2.50/mg
30 mg · $75.00
checked 30 Oct 2026
Peptide Science Now 40% cheaper
- Sermorelin
Catalyst Peptides
$8.40/mg
10 mg · $84.00
checked 21 Oct 2026
Peptide Science Now
$8.33/mg
15 mg · $125.00
checked 30 Oct 2026
Peptide Science Now 1% cheaper
- SS-31
Catalyst Peptides
$6.30/mg
10 mg · $63.00
checked 21 Oct 2026
Peptide Science Now
$6.00/mg
25 mg · $150.00
checked 30 Oct 2026
Peptide Science Now 5% cheaper
- TB-500
Catalyst Peptides
$6.50/mg
10 mg · $65.00
checked 21 Oct 2026
Peptide Science Now
$13.50/mg
10 mg · $135.00
checked 30 Oct 2026
Catalyst Peptides 52% cheaper
- Testagen
Catalyst Peptides
$3.85/mg
20 mg · $77.00
checked 21 Oct 2026
Peptide Science Now
$3.25/mg
20 mg · $65.00
checked 30 Oct 2026
Peptide Science Now 16% cheaper
- Thymalin
Catalyst Peptides
$6.00/mg
10 mg · $60.00
checked 21 Oct 2026
Peptide Science Now
$6.00/mg
20 mg · $120.00
checked 30 Oct 2026
Same price
- Thymosin Alpha-1
Catalyst Peptides
$7.80/mg
10 mg · $78.00
checked 21 Oct 2026
Peptide Science Now
$13.00/mg
10 mg · $130.00
checked 30 Oct 2026
Catalyst Peptides 40% cheaper
- Tirzepatide
Catalyst Peptides
$5.40/mg
20 mg · $108.00
checked 21 Oct 2026
Peptide Science Now
$16.33/mg
15 mg · $245.00
checked 30 Oct 2026
Catalyst Peptides 67% cheaper
- Vilon
Catalyst Peptides
$3.00/mg
20 mg · $60.00
checked 21 Oct 2026
Peptide Science Now
$3.25/mg
20 mg · $65.00
checked 30 Oct 2026
Catalyst Peptides 8% cheaper
- VIP
Catalyst Peptides
$12.00/mg
10 mg · $120.00
checked 21 Oct 2026
Peptide Science Now
$12.50/mg
6 mg · $75.00
checked 30 Oct 2026
Catalyst Peptides 4% cheaper
| Peptide | Catalyst Peptides | Peptide Science Now | Difference per mg |
|---|---|---|---|
| AICAR | $1.12/mg 50 mg · $56.00 checked 21 Oct 2026 | $1.00/mg 50 mg · $50.00 checked 30 Oct 2026 | Peptide Science Now 11% cheaper |
| AOD-9604 | $9.60/mg 10 mg · $96.00 checked 21 Oct 2026 | $10.83/mg 6 mg · $65.00 checked 30 Oct 2026 | Catalyst Peptides 11% cheaper |
| ARA-290 | $5.90/mg 10 mg · $59.00 checked 21 Oct 2026 | $4.69/mg 16 mg · $75.00 checked 30 Oct 2026 | Peptide Science Now 21% cheaper |
| BPC-157 | $5.40/mg 10 mg · $54.00 checked 21 Oct 2026 | $9.33/mg 15 mg · $140.00 checked 30 Oct 2026 | Catalyst Peptides 42% cheaper |
| Cagrilintide | $12.60/mg 10 mg · $126.00 checked 21 Oct 2026 | $14.50/mg 10 mg · $145.00 checked 30 Oct 2026 | Catalyst Peptides 13% cheaper |
| DSIP | $5.20/mg 10 mg · $52.00 checked 21 Oct 2026 | $10.00/mg 5 mg · $50.00 checked 30 Oct 2026 | Catalyst Peptides 48% cheaper |
| Epithalon | $3.15/mg 10 mg · $31.50 checked 21 Oct 2026 | $3.80/mg 50 mg · $190.00 checked 30 Oct 2026 | Catalyst Peptides 17% cheaper |
| FOXO4-DRI | $31.50/mg 10 mg · $315.00 checked 21 Oct 2026 | $25.00/mg 10 mg · $250.00 checked 30 Oct 2026 | Peptide Science Now 21% cheaper |
| GHK-Cu | $0.700/mg 100 mg · $70.00 checked 21 Oct 2026 | $1.40/mg 50 mg · $70.00 checked 30 Oct 2026 | Catalyst Peptides 50% cheaper |
| GHRP-2 | $5.00/mg 10 mg · $50.00 checked 21 Oct 2026 | $5.00/mg 10 mg · $50.00 checked 30 Oct 2026 | Same price |
| GHRP-6 | $5.00/mg 10 mg · $50.00 checked 21 Oct 2026 | $5.00/mg 10 mg · $50.00 checked 30 Oct 2026 | Same price |
| Glutathione | $0.051/mg 1500 mg · $77.00 checked 21 Oct 2026 | $0.142/mg 600 mg · $85.00 checked 30 Oct 2026 | Catalyst Peptides 64% cheaper |
| Hexarelin | $13.00/mg 5 mg · $65.00 checked 21 Oct 2026 | $9.00/mg 5 mg · $45.00 checked 30 Oct 2026 | Peptide Science Now 31% cheaper |
| IGF-1 LR3 | $75.00/mg 1 mg · $75.00 checked 21 Oct 2026 | $110.00/mg 1 mg · $110.00 checked 30 Oct 2026 | Catalyst Peptides 32% cheaper |
| Ipamorelin | $5.60/mg 10 mg · $56.00 checked 21 Oct 2026 | $8.00/mg 10 mg · $80.00 checked 30 Oct 2026 | Catalyst Peptides 30% cheaper |
| Kisspeptin | $5.25/mg 10 mg · $52.50 checked 21 Oct 2026 | $13.00/mg 5 mg · $65.00 checked 30 Oct 2026 | Catalyst Peptides 60% cheaper |
| KPV | $4.50/mg 10 mg · $45.00 checked 21 Oct 2026 | $11.00/mg 5 mg · $55.00 checked 30 Oct 2026 | Catalyst Peptides 59% cheaper |
| LL-37 | $11.40/mg 5 mg · $57.00 checked 21 Oct 2026 | $19.00/mg 5 mg · $95.00 checked 30 Oct 2026 | Catalyst Peptides 40% cheaper |
| Melanotan 1 | $4.50/mg 10 mg · $45.00 checked 21 Oct 2026 | $5.50/mg 10 mg · $55.00 checked 30 Oct 2026 | Catalyst Peptides 18% cheaper |
| MGF | $25.00/mg 2 mg · $50.00 checked 21 Oct 2026 | $27.00/mg 5 mg · $135.00 checked 30 Oct 2026 | Catalyst Peptides 7% cheaper |
| MOTS-C | $4.20/mg 10 mg · $42.00 checked 21 Oct 2026 | $11.00/mg 10 mg · $110.00 checked 30 Oct 2026 | Catalyst Peptides 62% cheaper |
| NAD+ | $0.087/mg 1000 mg · $87.50 checked 21 Oct 2026 | $0.400/mg 750 mg · $300.00 checked 30 Oct 2026 | Catalyst Peptides 78% cheaper |
| Oxytocin | $4.50/mg 10 mg · $45.00 checked 21 Oct 2026 | $6.50/mg 10 mg · $65.00 checked 30 Oct 2026 | Catalyst Peptides 31% cheaper |
| P21 | $29.90/mg 10 mg · $299.00 checked 21 Oct 2026 | $24.00/mg 5 mg · $120.00 checked 30 Oct 2026 | Peptide Science Now 20% cheaper |
| PEG-MGF | $24.00/mg 2 mg · $48.00 checked 21 Oct 2026 | $19.00/mg 5 mg · $95.00 checked 30 Oct 2026 | Peptide Science Now 21% cheaper |
| Pinealon | $6.50/mg 10 mg · $65.00 checked 21 Oct 2026 | $3.75/mg 20 mg · $75.00 checked 30 Oct 2026 | Peptide Science Now 42% cheaper |
| PNC-27 | $7.20/mg 10 mg · $72.00 checked 21 Oct 2026 | $30.00/mg 5 mg · $150.00 checked 30 Oct 2026 | Catalyst Peptides 76% cheaper |
| Retatrutide | $10.00/mg 30 mg · $300.00 checked 21 Oct 2026 | $15.83/mg 12 mg · $190.00 checked 30 Oct 2026 | Catalyst Peptides 37% cheaper |
| Selank | $4.20/mg 10 mg · $42.00 checked 21 Oct 2026 | $5.50/mg 10 mg · $55.00 checked 30 Oct 2026 | Catalyst Peptides 24% cheaper |
| Semaglutide | $7.13/mg 20 mg · $142.50 checked 21 Oct 2026 | $22.50/mg 10 mg · $225.00 checked 30 Oct 2026 | Catalyst Peptides 68% cheaper |
| Semax | $4.20/mg 10 mg · $42.00 checked 21 Oct 2026 | $2.50/mg 30 mg · $75.00 checked 30 Oct 2026 | Peptide Science Now 40% cheaper |
| Sermorelin | $8.40/mg 10 mg · $84.00 checked 21 Oct 2026 | $8.33/mg 15 mg · $125.00 checked 30 Oct 2026 | Peptide Science Now 1% cheaper |
| SS-31 | $6.30/mg 10 mg · $63.00 checked 21 Oct 2026 | $6.00/mg 25 mg · $150.00 checked 30 Oct 2026 | Peptide Science Now 5% cheaper |
| TB-500 | $6.50/mg 10 mg · $65.00 checked 21 Oct 2026 | $13.50/mg 10 mg · $135.00 checked 30 Oct 2026 | Catalyst Peptides 52% cheaper |
| Testagen | $3.85/mg 20 mg · $77.00 checked 21 Oct 2026 | $3.25/mg 20 mg · $65.00 checked 30 Oct 2026 | Peptide Science Now 16% cheaper |
| Thymalin | $6.00/mg 10 mg · $60.00 checked 21 Oct 2026 | $6.00/mg 20 mg · $120.00 checked 30 Oct 2026 | Same price |
| Thymosin Alpha-1 | $7.80/mg 10 mg · $78.00 checked 21 Oct 2026 | $13.00/mg 10 mg · $130.00 checked 30 Oct 2026 | Catalyst Peptides 40% cheaper |
| Tirzepatide | $5.40/mg 20 mg · $108.00 checked 21 Oct 2026 | $16.33/mg 15 mg · $245.00 checked 30 Oct 2026 | Catalyst Peptides 67% cheaper |
| Vilon | $3.00/mg 20 mg · $60.00 checked 21 Oct 2026 | $3.25/mg 20 mg · $65.00 checked 30 Oct 2026 | Catalyst Peptides 8% cheaper |
| VIP | $12.00/mg 10 mg · $120.00 checked 21 Oct 2026 | $12.50/mg 6 mg · $75.00 checked 30 Oct 2026 | Catalyst Peptides 4% cheaper |
Only at Catalyst Peptides: 15 peptides in the same market
Only at Peptide Science Now: 29 peptides in the same market
- Adipotide
- B7-33
- Bronchogen
- Cardiogen
- Cartalax
- Chonluten
- CJC-1295 NO DAC
- Cortagen
- Follistatin-315
- Follistatin-344
- GHK Basic
- GHRH
- Gonadorelin
- hGH Fragment 176-191
- Humanin
- Livagen
- N-Acetyl Epithalon Amidate
- N-Acetyl Selank Amidate
- N-Acetyl Semax Amidate
- Pancragen
- Prostamax
- TB-500 Fragment
- Thymogen
- Triptorelin
- Vesilute
- Vesugen
- Melanotan 2(Bulk)
- PT-141(Bulk)
- Tesamorelin(Bulk)
Catalyst Peptides compared with
- Lab Ratz Research51 shared
- NHOV49 shared
- Peptides direct to you49 shared
- Peptides GG48 shared
- Huaian Hanyou Peptide47 shared
- Research1peptides47 shared
- LabFirst Peptides46 shared
- Alpha Peptides45 shared
- Ares Research45 shared
- Vipris Biotechnology45 shared
- Nexus Bio Life44 shared
- VPeptide43 shared
- Bridge Research42 shared
- Luxe Peptides42 shared
- Pure Lab Peptides42 shared
- Eppixlabs41 shared
- Grey Axis Research41 shared
- Raw Amino41 shared
- Biotech Peptides40 shared
- Core Peptides40 shared
- Prime Longevity Peptides40 shared
- Amino Usa39 shared
- Cenexa Labs39 shared
- Priority Peptides39 shared
- Eros Peptides38 shared
- Grey Matters Research38 shared
- Peptide Science Store37 shared
- SQS Research37 shared
- TrueLab Peptides37 shared
- Nordsci Peptides36 shared
Peptide Science Now compared with
- Peptide Science Store63 shared
- Huaian Hanyou Peptide58 shared
- Peptides direct to you58 shared
- Nordsci Peptides57 shared
- Lab Ratz Research53 shared
- Peptides GG53 shared
- Core Peptides52 shared
- Raw Amino52 shared
- Luxe Peptides51 shared
- NHOV51 shared
- Vipris Biotechnology51 shared
- Amino Usa49 shared
- VPeptide49 shared
- Nexus Bio Life47 shared
- Prime Longevity Peptides45 shared
- Priority Peptides45 shared
- Research1peptides45 shared
- TrueLab Peptides43 shared
- Biotech Peptides42 shared
- Cenexa Labs42 shared
- LabFirst Peptides42 shared
- Pure Lab Peptides42 shared
- Grey Axis Research41 shared
- Grey Matters Research41 shared
- Eppixlabs40 shared
- Eros Peptides40 shared
- Alpha Peptides39 shared
- Ares Research39 shared
- Bridge Research37 shared
- SQS Research33 shared
Two listings are compared only when they are the same peptide in the same market, so a 10-vial kit is never set against a single vial. Price per mg is our arithmetic on the listed price, for comparison; the amount you pay is the listed price for the size shown, so check it on the vendor’s own page before you buy. What price per mg means.
No vendor can pay to change a price or the order of anything on this page. Some outbound links are affiliate links.