How Peptigrity actually works.

How trust scores are calculated

The Trust Score is a single number from 0 to 100 calculated from two data sources: community reviews and independent lab tests. The score scales by confidence in the data behind it — small samples carry less weight, large samples carry more.

The formula

Trust Score = Quality × Confidence × 100

Quality (0 to 1) combines two inputs:

• 0.4 × smoothed review average (normalized to 0–1 from a 0–5 scale)
• 0.6 × smoothed purity average (normalized to 0–1 from a 0–100% scale)

Lab purity is weighted at 60% because HPLC analysis provides objective, verifiable quality data. Community reviews are weighted at 40% because they reflect subjective buyer experience across quality, delivery, service, and pricing.

Confidence (0 to 1) scales the score by data volume:

• Confidence = min(1.0, ln(reviews + tests + 1) / ln(21))

The confidence factor uses a logarithmic curve that approaches 1.0 as the combined number of reviews and lab tests approaches 20. This caps the influence of low-volume shops and prevents a single 5-star review or a single 99% lab test from producing a score that competes with established shops carrying hundreds of data points.

Why we use Bayesian smoothing

Both the review average and the purity average are Bayesian-smoothed using priors. A new shop with one 5-star review does not get treated the same as an established shop with 150 reviews averaging 4.8. The smoothing uses:

• Review prior: 4.2 stars (the platform average)
• Purity prior: 98.5% (the platform average)
• Smoothing constant: K = 5

The smaller the sample, the more it's pulled toward the prior. Once a shop accumulates real volume, its actual data dominates. This prevents small-sample manipulation: a single cherry-picked review or lab test can't carry a brand-new shop to the top of the rankings.

Verification tiers

Every shop carries one of these labels based on data depth:

When one data channel has no trustworthy signal, its term contributes 0 — so the score caps at the other channel's weight (40 for reviews-only, 60 for lab-only). Once both channels contribute, the score can reach 100.

What the Trust Score does not include

The Trust Score does not factor in shop age, listing date, product selection, pricing, website design, social media presence, advertising spend, or any payment to Peptigrity. The calculation uses only two data inputs: review ratings and lab test purity data.

Score updates

Trust Scores recalculate automatically when new reviews or lab tests are published. A single new data point can change a shop's Trust Score — though Bayesian smoothing and confidence scaling mean the change is proportional to the existing data depth. A new review for a shop with 200 reviews moves the score less than a new review for a shop with 3 reviews.

Sub-ratings (independent of Trust Score)

Beyond the Trust Score itself, every Peptigrity review breaks down the buyer's experience into four sub-rating dimensions on a 1–5 scale: Quality, Delivery, Service, and Pricing. These are averaged separately per shop and displayed on each shop profile. The sub-ratings are informational — they help buyers see exactly where a shop performs well or struggles — and they are not factored into the Trust Score calculation itself.

A separate Would Buy Again indicator (yes/no) is tracked on every review and displayed as a percentage on each shop profile. This is also informational and not factored into the Trust Score directly.

Review policies

Who can submit reviews

Any registered Peptigrity user can submit 1 review per shop. Registration requires a username, email address, and password. Email addresses are never displayed publicly.

What reviews include

Each review includes 5 sub-ratings on a 1–5 scale:

1. Overall — general satisfaction with the purchase experience
2. Quality — product purity, consistency, and packaging
3. Delivery — shipping speed, tracking accuracy, and packaging integrity
4. Service — customer support responsiveness and helpfulness
5. Pricing — value relative to product quality and market rates

Each review also includes a "Would buy again" indicator (yes or no) and a free-text description for each sub-rating category.

Review moderation

Reviews are moderated for 4 criteria before publication:

1. Relevance — the review relates to the shop being reviewed
2. Registration — the reviewer has a registered Peptigrity account
3. Prohibited content — the review contains no personal information, threats, hate speech, or illegal content
4. Duplication — the reviewer has not already reviewed this shop

Reviews meeting all 4 criteria are published without editing. Negative reviews are not suppressed, deprioritized, or modified.

Lab test policies

What lab tests include

Each lab test submission includes the peptide name, brand or shop name, HPLC purity percentage, stated quantity (label), tested quantity (actual), endotoxin level (when tested), testing laboratory name, test date, batch ID (when available), and an image of the Certificate of Analysis.

Submission and verification

Lab tests are submitted by registered community members through the submission form. Each submission is reviewed by the Peptigrity team before publication. Peptigrity does not modify purity values or quantity measurements.

Publication transparency

All lab test results are published transparently regardless of outcome. A lab test showing 85% purity receives the same treatment as a lab test showing 99% purity. Low purity results are not hidden, delayed, or deprioritized.

Testing laboratory independence

Peptigrity publishes lab tests performed by third-party testing laboratories with no financial relationship to the peptide shop whose product was tested. In-house testing by vendors is not accepted.

Shop listing policies

How shops are listed

Shops are added to Peptigrity through 2 methods: community submission (a registered user adds the shop) or editorial addition (the Peptigrity team identifies the shop). Listing is free. No shop pays a listing fee, commission, or subscription.

Shop verification status

Each shop carries 1 of 2 verification statuses:

1. Community Submitted — the shop was added by a community member or the Peptigrity team. The shop owner has not verified their identity.
2. Claimed — the shop owner has contacted Peptigrity, proved ownership, and actively manages their listing. Claimed shops can update their profile and respond to reviews.

Claiming a listing does not affect the trust score. The verification status indicates only whether the shop owner is actively managing their profile.

Ranking order

Shops on the directory page are ranked by trust score in descending order. The shop with the highest trust score appears first. No shop can pay for priority placement, featured positioning, or ranking modification.

Removal policy

Shops cannot request removal from Peptigrity. Once listed, a shop remains in the directory along with all associated reviews and lab test data. The only exception is a listing created in error.

Promotion policies

Promotions are available to shops with a Trust Score of 70 or higher. Each promotion is reviewed by the Peptigrity team before publication. Promotions display the shop's current Trust Score and, when available, the most recent lab test purity for the promoted peptide.

Expired promotions remain visible on the platform for transparency and historical reference.

Content moderation

Peptigrity moderates 3 types of content: reviews, lab test submissions, and discussion posts. Moderation applies the same standards to all content regardless of the shop or user involved.

Content is removed only if it violates 1 of 4 criteria: contains personal information, contains threats or hate speech, is spam or commercially motivated fraud, or duplicates existing content from the same user.

Questions

For questions about these rules or to report a policy concern, visit the Contact Us page or review the FAQ.