For laboratory research use only — not for human consumption. This page is informational and does not constitute medical advice.
Alpha-Gen vs Zen Peptides
Head-to-head on 6 shared peptides: Alpha-Gen is cheaper on 0, Zen Peptides on 6. Average price gap 86% — compared Oct 19, 2026.
- Catalog
- 21 peptides
- In stock (shared)
- 6
- Last checked
- Oct 5, 2026(stale · 21d old)
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- Catalog
- 6 peptides
- In stock (shared)
- 6
- Last checked
- Oct 19, 2026(stale · 7d old)
Some outbound links are affiliate links — we may earn a commission on purchases made through them. It never affects rankings, prices, or purity data. How we make money
Price comparison — 6 shared peptides
Prices last checked Oct 19, 2026| Peptide | Alpha-Gen | Zen Peptides | Δ $/mg |
|---|---|---|---|
| AOD-9604 | $10.40/mg 5mg · $51.99 | $2.80/mgcheaper 50mg · $140.00 | 73% |
| KLOW | $2.36/mg 80mg · $188.79 | $0.33/mgcheaper 800mg · $265.00 | 86% |
| Retatrutide | $24.00/mg 5mg · $119.99 | $0.93/mgcheaper 300mg · $280.00 | 96% |
| Semaglutide | $8.00/mg 10mg · $80.00 | $0.53/mgcheaper 300mg · $160.00 | 93% |
| Tesamorelin | $9.60/mg 10mg · $96.00 | $2.45/mgcheaper 200mg · $490.00 | 74% |
| Tirzepatide | $8.00/mg 10mg · $80.00 | $0.41/mgcheaper 600mg · $245.00 | 95% |
Best available size tier per vendor, normalized to $/mg; in-stock tiers preferred. How prices are collected →
Third-party purity data
| Peptide | Alpha-Gen | Zen Peptides |
|---|---|---|
| Retatrutide | 99.6%AFinnrick | 99.5%AFinnrick |
| Tirzepatide | 99.6%AFinnrick | 99.8%AFinnrick |
On file: Alpha-Gen — 6 results (Finnrick ×6) · Zen Peptides — 4 results (Finnrick ×4).
Common questions
Is Alpha-Gen or Zen Peptides cheaper?
Across 6 peptides both vendors sell, Alpha-Gen has the lower $/mg price on 0 and Zen Peptides on 6. The average per-peptide price gap is 86%. The table above compares each vendor's best size tier on a $/mg basis.
Do Alpha-Gen and Zen Peptides have third-party lab tests?
Alpha-Gen has 6 third-party results on file (Finnrick ×6); Zen Peptides has 4 (Finnrick ×4). Independent labs test samples bought from vendors and publish HPLC purity — grade A (≥98%) is the research-use baseline.
How many peptides do Alpha-Gen and Zen Peptides both sell?
Both vendors list 6 of the same peptides, including AOD-9604, KLOW, Retatrutide, Semaglutide, Tesamorelin and 1 more. Alpha-Gen tracks 21 peptides total on PepVendors; Zen Peptides tracks 6.