BiltRx vs Arc-1: Tirzepatide Price Compared Side by Side

BiltRx and Arc-1 are the two compounded tirzepatide providers we track. Both require a prescription, both ship injectable tirzepatide directly to patients, and both cost a fraction of brand-name Mounjaro or Zepbound. But pricing structures, included fees, dose options and state availability differ enough that the right pick depends on your situation. Below is a full comparison with every number sourced and dated.

BiltRx vs Arc-1: Quick Price Comparison

BiltRx Tirzepatide Pricing

Flat $129 Monthly Rate

BiltRx charges $129 per month for compounded tirzepatide regardless of the dose prescribed (biltrx.com, verified 22 Oct 2026). Whether you are on the 2.5 mg starting dose or a higher maintenance dose, the medication itself costs the same. That flat structure is unusual. Most providers and pharmacies charge more as the dose increases because higher doses require more active ingredient. For patients who expect to escalate beyond 5 mg, the math tilts heavily in BiltRx's favor.

BiltRx fills prescriptions through Southend Pharmacy and Boothwyn Pharmacy, both US-licensed 503A compounding facilities. They also offer Buy Now Pay Later financing for patients who want to spread the cost over time.

Brand-Name Options ($1,499)

BiltRx also sells brand-name Mounjaro and Zepbound at $1,499 per month (biltrx.com, verified 22 Oct 2026). That is a significant premium over the compounded option but includes the FDA-approved product with Lilly's quality assurance. For comparison, Zepbound self-pay vials through LillyDirect cost $299 to $449 depending on dose (LillyDirect, October 2026). Unless you specifically want the convenience of BiltRx's telehealth-to-door model with the brand-name product, LillyDirect offers the same FDA-approved medication for less.

What Is Not Included in the Price

The $129 figure covers the compounded medication only. BiltRx charges separately for the initial consultation and for shipping. Those amounts are not published on their website. This matters when you compare against Arc-1, where both fees are included in the sticker price. We reached out to BiltRx for fee specifics and will update this section when they respond. Until then, factor in additional costs on top of $129 when budgeting. For the full price landscape across all tirzepatide sources, see our tirzepatide cost breakdown.

Arc-1 Tirzepatide Pricing

Dose-Based Pricing ($199.99 to $399.99)

Arc-1 charges by dose tier: $199.99 per month at 2.5 mg, $249.99 at 5 mg, and $399.99 at 7.5 mg (arc-1.co, verified 22 Oct 2026). The price reflects the fact that higher doses require more raw material. Their formulation adds glycine and vitamin B12 to the tirzepatide, which they market as supporting absorption and overall wellness. Whether those additions provide clinical benefit beyond the tirzepatide itself is not established by published trials.

A critical limitation: Arc-1 only offers three dose tiers. There is no 10 mg, 12.5 mg or 15 mg option. Patients whose prescribers titrate them beyond 7.5 mg will need to switch providers. That is a real constraint for longer-term treatment, since many patients stabilize at 10 mg or higher.

Free Consultation and Shipping

Arc-1 includes consultation and expedited shipping in the listed price. No separate line items. They also offer a 30-day satisfaction guarantee. This all-inclusive model makes the total monthly cost predictable: what you see on the pricing page is what you pay. It simplifies budgeting and makes head-to-head comparisons more straightforward. Our cheapest tirzepatide ranking factors in these bundled costs.

State Restrictions (5 States Excluded)

Arc-1 does not ship to California, Arkansas, Indiana, Minnesota, or South Carolina (arc-1.co, verified 22 Oct 2026). State-level pharmacy regulations create these gaps. If you live in one of those states, BiltRx is your compounded option. California alone accounts for roughly 12% of the US population, so this restriction affects a substantial number of potential patients.

Total Cost Over 6 Months

A single monthly price does not capture the real cost of tirzepatide treatment. Most patients start at 2.5 mg and escalate. The table below projects six-month totals at three dose levels, using published medication prices only. BiltRx totals do not include consultation and shipping fees, which would increase the BiltRx figures.

At every dose, BiltRx's medication-only cost is lower. But the gap narrows once you add BiltRx's undisclosed consultation and shipping fees. At 2.5 mg the difference is $425.94 before those fees. If BiltRx's fees total $50 to $70 per month, the two providers land in a similar range at the starting dose. At 7.5 mg, BiltRx maintains a large advantage regardless of fee structure. For annual projections across all providers including Zepbound and Mounjaro, use our tirzepatide cost calculator.

Beyond Price: Key Differences

Formulation (Plain vs Glycine + B12)

BiltRx compounds plain tirzepatide. Arc-1 adds glycine and vitamin B12 to the injection. Glycine is an amino acid that some compounders include as a stabilizer or to reduce injection-site discomfort. B12 is added as a general wellness supplement. No published clinical trial has compared tirzepatide-only formulations against tirzepatide-plus-additives for weight loss or metabolic outcomes. The additives are unlikely to cause harm, but the clinical value is unproven.

Pharmacy Type and Certification

BiltRx fills through Southend Pharmacy and Boothwyn Pharmacy, both US-licensed 503A compounding pharmacies. Arc-1 is LegitScript-certified, a voluntary third-party accreditation that verifies pharmacy licensing, regulatory compliance, and business practices. LegitScript certification is not required by law but provides an additional layer of verification that some patients find reassuring. Both providers operate within the legal compounding framework.

Available Dose Range

BiltRx offers the full tirzepatide dose range, matching what you would get with brand-name Mounjaro or Zepbound. Arc-1 stops at 7.5 mg. Standard tirzepatide titration goes up to 15 mg. Patients who respond to treatment but need higher doses for continued weight loss or blood sugar control will outgrow Arc-1's offerings. That makes Arc-1 a viable starter option but potentially not a long-term provider.

Our Editorial Verdict

There is no outright winner. BiltRx wins on base medication price, and it wins decisively at higher doses where the flat $129 rate saves hundreds compared to Arc-1's $399.99 at 7.5 mg. For patients who plan to titrate above 7.5 mg, BiltRx is the only compounded option on the table since Arc-1 does not offer those doses at all.

Arc-1 wins on pricing transparency. The sticker price is the total price. No guessing about consultation fees or shipping surcharges. The 30-day satisfaction guarantee and free expedited shipping add value that is hard to quantify but real. At the 2.5 mg starting dose, the total cost difference between the two providers may be modest once BiltRx's undisclosed fees are included.

The deciding factors come down to dose and state. If you live in California, Arkansas, Indiana, Minnesota, or South Carolina, BiltRx is your only option. If you expect to stay at 2.5 or 5 mg and want all-inclusive pricing with no surprises, Arc-1 is worth the premium. If you want the lowest possible medication cost or need doses above 7.5 mg, BiltRx is the stronger choice. Both are legitimate compounded providers operating through US-licensed pharmacies. For the broader comparison including brand-name options, see our tirzepatide cost guide.