# Peptide Cost Per Milligram — How to Calculate True Value Across Suppliers
For research purposes only. All compounds listed are sold exclusively for laboratory and scientific research use.
The single most important number when comparing research peptide suppliers isn't the total order price — it's cost per milligram ($/mg). A $25 vial and a $55 vial can represent identical value, or one can be three times more expensive, depending purely on peptide content.
This guide explains the $/mg calculation, walks through worked examples for the most commonly researched peptides, and shows you how to use our free Peptide Cost Calculator to automate the math.
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The Core Formula
> $/mg = Total Price ÷ Peptide Content (mg)
For simple lyophilized vials:
- •A BPC-157 vial that costs $36.99 and contains 10 mg of BPC-157 = $3.70/mg
- •A BPC-157 vial that costs $11.46 and contains 5 mg = $2.29/mg
The $11.46 vial is cheaper per unit — but the $36.99 vial for 10 mg gives you more peptide for the overall spend. The $/mg calculation tells you which is actually cheaper.
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Why This Matters: The Hidden Price Trap
Most peptide suppliers list products with identical names but radically different quantities. Without $/mg normalization, researchers routinely overpay.
Real example from our database:
| Supplier | Product | Listed Price | Content | $/mg |
|---|---|---|---|---|
| Buy Peptides USA | BPC-157 10 mg Kit | $36.99 | 10 mg | $3.70 |
| Direct Peptides US | BPC-157 5 mg | $11.46 | 5 mg | $2.29 |
| Apex Peptides | BPC+TB+GHK Blend | $1.45 | ~0.01 mg equiv. | $0.01 (blend — not comparable) |
| Bulk Supply | BPC-157 10 mg Kit | $275 | 10 mg | $27.50 |
| Modern Research Peptides | BPC-157 10 mg Kit | $31.99 | 10 mg | $3.20 |
The Bulk Supply listing is 7.4x more expensive per milligram than Modern Research Peptides for an identical compound. Without $/mg calculation, a researcher looking at $275 vs $36.99 might assume they're getting something categorically different — but the underlying peptide content is the same.
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How to Calculate $/mg: Step-by-Step
Step 1: Find the peptide content
This is on the product label or listing. Look for: "5 mg," "10 mg," "2 mg" etc. For vials stated as "5000 mcg," divide by 1000 to get mg (5000 mcg = 5 mg).
Step 2: Separate shipping and handling costs
If you're comparing a supplier that charges $8 shipping vs. one with free shipping, add the shipping cost proportionally when comparing single-unit orders. For multi-vial orders, amortize the shipping cost across units.
Example:
- •Supplier A: $32 + $8 shipping = $40 total for 10 mg → $4.00/mg including shipping
- •Supplier B: $45 with free shipping for 10 mg → $4.50/mg including shipping
Supplier A is actually cheaper when shipping is factored in.
Step 3: Account for discount codes and sales
Apply any available promo codes before calculating final $/mg. A 10% discount on a $45 vial brings effective price to $40.50, changing $/mg accordingly.
Step 4: Adjust for concentration (if applicable)
Some products are sold as pre-mixed solutions. These require a different calculation:
> $/mg (solution) = Total Price ÷ (Volume in mL × Concentration in mg/mL)
Example: A 30 mL BPC-157 solution at 500 mcg/mL (0.5 mg/mL):
- •Total peptide = 30 × 0.5 = 15 mg
- •If price = $45: $/mg = $45 ÷ 15 = $3.00/mg
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Worked Examples by Peptide
BPC-157 $/mg Across the Market
BPC-157 (Body Protection Compound 157) is the most widely researched healing peptide. Our live database shows current $/mg ranging from $2.29 to $27.50 for standard research-grade material.
Why such a wide range?
- •Manufacturing source (domestic synthesis vs. Chinese CMO)
- •Testing depth (HPLC only vs. HPLC + mass spec + endotoxin)
- •Lyophilized vs. raw powder vs. nasal spray formulation
- •Supplier markup and business model
Reference range (2026, U.S. market):
- •Budget tier: $2–$4/mg
- •Mid tier: $4–$8/mg
- •Premium tier: $8–$15/mg
- •Overpriced / avoid: >$15/mg without extraordinary justification
TB-500 (Thymosin Beta-4 Fragment) $/mg
TB-500 is a larger peptide (44 amino acids vs. BPC-157's 15), which makes it more expensive to synthesize. Expect higher $/mg than BPC-157 for equivalent quality.
Current market range (2026):
- •Budget tier: $3–$7/mg
- •Mid tier: $7–$14/mg
- •Premium: $14–$25/mg
From our data: Peptide Supply Group lists 5 mg TB-500 at $70 = $14/mg. Modern Research Peptides' 10 mg kit at $31.99 = $3.20/mg — a significant difference for the same compound.
GHK-Cu $/mg
GHK-Cu (Copper peptide) is a 3-amino-acid copper complex used extensively in skin and wound healing research. It's relatively inexpensive to manufacture.
Current market range:
- •Budget: $1–$5/mg
- •Mid: $5–$15/mg
- •Overpriced: >$20/mg for standard lyophilized
Tirzepatide / GLP-1 Analogs $/mg
GLP-1 research peptides are the most expensive category due to synthesis complexity (long sequences, careful manufacturing required to avoid racemization).
Current market range:
- •Most competitive: ~$17–$20/mg (e.g., Pure Tested Peptides GLP-3 RETA)
- •Mid range: $50–$120/mg
- •High-end research grade: $120–$200/mg
The 10x spread here is larger than any other peptide category. At $17/mg, a typical research dose of a GLP-1 analog represents $68–$136 per dose; at $200/mg, the same dose is $800–$1,600. Comparison shopping is essential for this category.
Epitalon $/mg
Epitalon is a 4-amino-acid telomerase-activating peptide popular in longevity research.
From our database: Aminowell Labs lists Epitalon at $0/mg (free-to-claim promotional listing). For paid listings, expect:
- •Budget: $0.50–$2/mg
- •Mid: $2–$5/mg
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Common $/mg Calculation Errors
Error 1: Confusing mcg and mg
A product listed as "500 mcg" costs more per mg than one listed as "5 mg," because you're getting 100x less peptide. Always convert to the same unit before comparing.
Rule: 1 mg = 1,000 mcg. Divide mcg by 1,000 to get mg.
Error 2: Not accounting for blends
A BPC+TB blend priced attractively per vial doesn't mean either component is cheap. If the blend is 2 mg BPC + 2 mg TB, calculate $/mg for each component separately before comparing to single-peptide vials.
Error 3: Comparing free samples to purchased products
Some suppliers offer free "gift" vials. These aren't relevant to $/mg comparisons for ongoing research budgets — they're acquisition cost-reduction tools, not pricing benchmarks.
From our data: "FREE GIFT: BPC 157 10mg" listings at $0 from several suppliers are free with purchase — they don't represent a real $/mg for budget planning.
Error 4: Ignoring minimum order quantities
Some of the best $/mg prices only apply at minimum quantities of 5, 10, or 50 units. If your research needs only 2 vials, a great bulk price doesn't help.
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Using the Peptides.SO Price Calculator
Our free Peptide Research Cost Calculator automates these calculations. You can:
1. Input a research protocol (peptide, dose per administration, frequency, duration)
2. See total mg required for the full protocol
3. Compare cost across suppliers using our live price index
4. Calculate cost-per-protocol for budget planning
Example calculation:
- •Peptide: BPC-157
- •Protocol: 250 mcg twice daily for 12 weeks
- •Total mg: 0.25 mg × 2 × 84 days = 42 mg
- •At $3.70/mg: Protocol cost = $155.40
- •At $2.29/mg: Protocol cost = $96.18
The cheapest source saves $59.22 on a single 12-week protocol — meaningful for research on constrained budgets.
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$/mg Reference Table — Major Research Peptides (2026)
| Peptide | Good Value ($/mg) | Market Average | Overpriced |
|---|---|---|---|
| BPC-157 | <$4 | $4–$10 | >$15 |
| TB-500 | <$7 | $7–$15 | >$25 |
| GHK-Cu | <$5 | $5–$15 | >$25 |
| CJC-1295 | <$5 | $5–$12 | >$20 |
| Ipamorelin | <$3 | $3–$8 | >$15 |
| PT-141 | <$5 | $5–$15 | >$25 |
| Tirzepatide | <$25 | $25–$80 | >$120 |
| Semaglutide | <$20 | $20–$60 | >$100 |
| Epitalon | <$2 | $2–$8 | >$15 |
| AOD-9604 | <$3 | $3–$8 | >$15 |
| NAD+ | <$0.50 | $0.50–$2 | >$5 |
Based on Peptides.SO live price index as of April 2026. View live data →
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When $/mg Alone Isn't Enough
The lowest $/mg isn't always the right choice. Factors that justify paying more:
1. Verified independent COA. A 10% premium for third-party HPLC + mass spec confirmation is almost always worth it for critical research. An impure compound that ruins an experiment costs far more in lost time and materials.
2. Domestic shipping speed. If your research is time-sensitive, a domestic supplier charging $1 more/mg but shipping in 2 days vs. 10 days may be worth the premium.
3. Supplier transparency. Suppliers who publish their testing methodology, testing lab, and batch results provide better research confidence. This transparency has a cost.
4. Track record. Established suppliers with a documented history of accurate products are worth a modest premium over new entrants, even if the new entrant offers a better $/mg.
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FAQ: Peptide Cost Per Milligram
Q: What's a reasonable peptide budget for a typical research protocol?
A: For common peptides (BPC-157, TB-500), budget $100–$300 per 8–12 week protocol. GLP-1 research protocols run $500–$2,000+ depending on the peptide and dosing.
Q: How do I know if a peptide's $/mg is unusually low?
A: Compare to our reference table above and check the supplier's COA. Prices far below the "good value" threshold warrant extra scrutiny — either the quantity is smaller than stated, the compound is lower purity, or the supplier has an unusual sourcing advantage.
Q: Does buying in bulk lower $/mg significantly?
A: Yes, for many suppliers. See our Bulk Peptide Pricing Guide for detailed analysis of when volume discounts make financial sense.
Q: Does $/mg matter differently for different peptide types?
A: Yes. For short-sequence peptides (3–5 amino acids like GHK-Cu or Epitalon), manufacturing cost is low enough that dramatic $/mg differences signal quality variation. For long-sequence peptides (GLP-1 analogs), wide $/mg spreads more often reflect legitimate cost differences in synthesis difficulty and testing.
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Further Reading:
- •Cheapest Research Peptide Suppliers 2026 — Price Comparison Across 8+ Retailers
- •Free Shipping Peptide Suppliers 2026 — Complete Shipping Cost Comparison
- •Peptide Supplier Sales Calendar 2026 — When to Buy for Best Prices
- •Bulk Peptide Pricing Guide — When Does Buying More Actually Save Money?
- •Peptide Stack Builder
- •Dosage Chart
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Data from Peptides.SO live price database. Updated weekly. For research purposes only. Always verify supplier COAs before use.