Science.bio Closed: Best Alternatives for 2026

Science.bio sent its final email on January 27, 2026. The subject line was blunt: "Science.bio is permanently closing." Regulatory compliance pressure — the same force that has been reshaping the research chemical industry for two years — finally caught up with one of the most trusted names in the space.

If you relied on Science.bio for peptides, nootropics, or research chemicals, you are not alone. The subreddits lit up within hours. Thousands of researchers lost their go-to source overnight. This guide will tell you exactly where to go next — and how to verify quality so you don't get burned by a low-quality replacement.

Why Did Science.bio Close?

Science.bio cited "regulatory compliance reasons" in their closure email. This tracks with a broader FDA enforcement trend that has been accelerating since 2024. The agency has been targeting vendors of research chemicals — especially those whose marketing language, even subtly, suggests human use.

Science.bio was never a fly-by-night operation. They had HPLC testing, published COAs, and a loyal community. Their closure signals that even compliant, quality-focused vendors are not immune from regulatory pressure. It is not about whether a vendor is "good" — it is about business sustainability in a tightening legal environment.

Other vendors have been watching. Some have quietly updated their product listings, removed certain compounds, or added stricter "research use only" language. The industry is adapting.

What to Look for in a Science.bio Alternative

Before we list options, here is the quality checklist Science.bio set the bar for. Any replacement should meet all of these:

• HPLC purity testing: Independent lab analysis showing purity. A minimum of 96% is acceptable for research grade. 99%+ is excellent.
• Published COAs: The Certificate of Analysis should be on the website, batch-specific, and from a third-party lab (not the vendor's own lab).
• Endotoxin (LPS) testing: This is increasingly important and separates serious vendors from budget suppliers. Bacterial endotoxins can cause inflammation responses in research settings.
• US-based: Domestic vendors ship faster and carry less risk of customs seizure.
• Established reputation: Reddit communities (r/Peptides, r/PeptidesResearch, r/Biohackers) are your best real-world reputation check.

Best Science.bio Alternatives in 2026

1. Limitless Biotech — Best Overall

Website: limitlessbiotech.com

Limitless Biotech has emerged as the consensus top pick following Science.bio's closure. They carry a wide selection of research peptides with rigorous third-party HPLC testing and published COAs for every batch. Their industry recognition is strong, and shipping is reliable. If you want the closest one-to-one replacement for Science.bio, this is it.

Best for: Researchers who want the broadest selection with the highest QA standards.

2. SwissChems — Best Value

Website: swisschems.is

SwissChems offers competitive pricing across peptides, SARMs, and nootropics. Their testing documentation is solid, and they have been in the market long enough to have a real track record. If price-per-mg matters to your research budget, SwissChems consistently delivers without sacrificing documentation quality.

Best for: High-volume researchers watching cost per unit.

3. Felix Chemical Supply — Best for Domestic, Tested Peptides

Website: felixchemsupply.com

Felix Chemical Supply has been earning community trust through comprehensive testing — including endotoxin testing, which many vendors skip. They are US-based, which means faster shipping and no import risk. Their peptide selection focuses on quality over breadth. Felix is also notable for transparent pricing with no surprise fees.

Best for: US researchers who prioritize endotoxin testing and domestic shipping.

4. Core Peptides — Widest Selection

Website: corepeptides.com

If you are researching a less-common peptide that other vendors do not stock, Core Peptides is often the fallback. Their catalog is extensive. Community sentiment is generally positive, though January 2026 saw a report of a delayed large order — something to note for time-sensitive research timelines.

Best for: Finding obscure or specialty peptides.

5. Pure Rawz — Established Alternative

Website: purerawz.co

Pure Rawz predates Science.bio and has survived multiple waves of regulatory pressure. They stock peptides alongside SARMs, nootropics, and research chemicals. Their COA documentation is publicly available. Not the cheapest, but their longevity in the space is meaningful.

Best for: Researchers who want a vendor with a proven track record of staying in business.

6. Peptide Sciences — Clinical-Grade Focus

Website: peptidesciences.com

Peptide Sciences sits at the premium end of the market. Their products are GMP-compliant and their testing standards are among the highest in the research space. Pricing reflects this. If your research demands the highest possible purity and you have budget to match, Peptide Sciences is worth the premium.

Best for: Research requiring the highest purity standards.

Rising Vendors to Watch in 2026

Apollo Peptide Sciences

Apollo is a newer entrant that has been building a quiet reputation — particularly for retatrutide availability. They combine competitive pricing with solid testing documentation. Community reception has been largely positive. Worth watching as they scale.

Ascension Peptides

Ascension has gained recognition in the peptide stacking community, particularly around the Wolverine Stack protocol. They appear to focus on recovery and performance peptides. Still building their public track record, but early community signals are encouraging.

How to Verify Any Peptide Vendor (The Fast Way)

With Science.bio gone, bad actors will try to capture displaced traffic. Here is how to check any vendor before you buy:

1. Search Reddit: Go to Reddit and search "[vendor name] review 2026". Real community experiences — good and bad — surface fast. Look for posts beyond the last 6 months.
2. Check for COAs: Go to the vendor's website. If you cannot find a batch-specific Certificate of Analysis from a third-party lab within 60 seconds, move on.
3. Look for HPLC + endotoxin: HPLC shows purity. Endotoxin (LAL) testing shows contamination. A vendor that does both earns trust.
4. Use Finnrick Analytics: Finnrick (finnrick.com) independently tests vendor products and publishes purity and quantity accuracy data. It is the most objective vendor comparison tool available.
5. Check Peptok vendor directory: Our vendor directory tracks trust scores, testing standards, and community ratings across top suppliers.

What Was Science.bio Known For?

For researchers unfamiliar with Science.bio's catalog, they were particularly known for:

• A wide nootropics selection including racetams, eugeroics, and cognitive compounds
• Peptides including BPC-157, TB-500, Selank, Semax, and GLP-1 compounds
• HPLC-verified third-party COAs
• Relatively transparent pricing and straightforward ordering

The closure has hit the nootropics community especially hard — many nootropic compounds are harder to find at research grade than peptides. For peptide-specific needs, the alternatives above cover most of what Science.bio offered.

The Bigger Picture: Is the Industry Shrinking?

Science.bio's closure is not an isolated event. In the past 18 months, multiple vendors have exited the market or significantly reduced their product offerings. This is the direct result of FDA enforcement escalation combined with state-level actions on research chemicals.

The vendors most likely to survive long-term are those who:

• Maintain strict "research use only" language across all marketing
• Invest in genuine third-party testing (not vanity COAs)
• Focus on peptides specifically (vs. research chemicals broadly, which carry higher regulatory risk)
• Build real community trust through transparency

The Peptok vendor directory monitors this landscape continuously. We track which vendors are active, their testing standards, and community reputation in real time. Check the directory before purchasing from any supplier.

Quick Comparison Table

Bottom Line

Science.bio was one of the good ones. Their closure is a real loss for the research community — not because alternatives do not exist, but because their reputation took years to build and that trust cannot be instantly replaced.

The good news: Limitless Biotech, SwissChems, and Felix Chemical Supply all meet or exceed the quality standards Science.bio set. Start with one of these three. Verify COAs. Check Reddit before any large order. And use our vendor directory for ongoing quality tracking.

The research peptide space is not going away. It is evolving. The vendors who survive will be the ones who earn trust the hard way — through testing, transparency, and consistency.