Natural Alternatives International

Carlsbad, CaliforniaReviewed Oct 11, 2026

Private label contract manufacturer that also develops proprietary beta-alanine ingredients.

IR ASSESSED· Enforcement Records Reviewed

FDA enforcement databases, inspection classifications, and warning letter archives reviewed per our Tier 4 protocol. No unresolved adverse findings identified in our review as of the vendor's review date.

Assessed: October 2026How we assess vendors →

MOQ: Not publicly disclosed
LEAD TIME: Not publicly disclosed

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Overview

Natural Alternatives International (NAI) is a publicly traded (NASDAQ: NAII) contract manufacturer of nutritional supplements headquartered in Carlsbad, California. Founded in 1980, NAI provides formulation, manufacturing, and marketing support services for dietary supplement brands. The company specializes in private-label contract manufacturing. Its NSF/ANSI 455-2 GMP certification is independently confirmed in NSF's public listings; it additionally reports holding NSF Certified for Sport and TGA (Therapeutic Goods Administration, Australia) registration, both self-reported. NAI reported $142.5 million in net sales for its fiscal year ended June 30, 2026, up 10% from fiscal 2025, with private-label contract manufacturing sales up 11%. The company also develops proprietary ingredients, including its beta-alanine products under the CarnoSyn and TriBsyn brands. As of June 30, 2026, NAI reported 301 employees (219 in the U.S.), with manufacturing facilities in Vista and Carlsbad, California, and in Manno, Switzerland.

Banned Substance Testing cGMP (Current Good Manufacturing Practice)Dosage Form FDA Facility Registration Formulation Ingredient Sourcing NSF International Private Label

Certifications

1 of 3 certifications independently confirmed. What this means

NSF/ANSI 455-2 (GMP)(Confirmed)NSF Certified for Sport(Self-Reported)TGA (Australia)(Self-Reported)

Capabilities

PRODUCT TYPES: Private Label Supplements · Custom Formulated Supplements · Capsule Supplements · Tablet Supplements · Powder Supplements · Proprietary Ingredients (CarnoSyn, TriBsyn)
CAPABILITIES: Custom formulas · Private label or white label · R&D or product development · High-volume production · Regulatory or compliance help
DOSAGE FORMS: capsules · powders · tablets

Sources

Natural Alternatives International - Official Website(2026-10-11)
Natural Alternatives International - Certifications & Associations(2026-10-11)
SEC EDGAR - Natural Alternatives International Form 10-K, fiscal year ended June 30, 2026(2026-10-11)
NASDAQ - NAII Stock Profile(2026-03-27)
Yahoo Finance - NAII Financial Data(2026-03-27)
GlobeNewsWire - NAI Q1 FY2026 Results(2026-03-27)

What we couldn't verify

We did not visit this company on site. See the limits that apply to every listing.

NSF GMP is independently confirmed via public registry (NSF GMP directory); remaining certifications are self-reported from the company website and SEC filings (audit 2026-05-21)
Enterprise-tier manufacturer; minimum order quantities likely higher than smaller CMs
Southern California location overlaps with existing CA-based CMs in directory

Dietary supplement manufacturers must comply with 21 CFR Part 111 (cGMP). What Part 111 requires

The connection map between Natural Alternatives International and other vendors, capabilities, and certifications is in the manufacturer atlas.

Enforcement screening: included in Inventory Ready's most recent completed pass against FDA's published recall datasets (2026-07-09). Method and limits →

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