Supplementation Glossary for Fitness Professional 2026

A fitness professional works in a technical field, but does not always master the exact terminology. Knowing what “bioavailability”, “sell-through”, “third-party report” or “HCl” is changes the quality of the conversation with the brand, student and colleague. This glossary organizes, by family, the essential terms in 2026.

The premise

Direct answer: Supplementation glossary for professionals does not intend to exhaust terms — it prioritizes those that appear in everyday conversations with students, brands and curation platforms. It covers four families: product, technical, regulation, business. Functions as a quick reference; does not replace scientific reading or formal training.

Family 1 — Product Categories

whey protein

Casein

Creatine

Beta-Alanine

Caffeine

Omega-3 (EPA/DHA)

Collagen

Thermogenic

Multivitamin

Pre-workout

BCAA

EAA

Citrulline

Glutamine

HMB

Probiotics

Family 2 — Technical concepts

Bioavailability

Absorption

Half-life

Timing

Effective dose

Anabolic window

Saturation

Maintenance

Wash-out period

Reference studies

Placebo

Family 3 — Quality and regulation

Anvisa

RDC 243

Third party report

Traceability

GMP (Good Manufacturing Practices)

Amino spiking

Proprietary Blend

claim

Batch

Expiration date

Family 4 — Market and business

D2C (Direct-to-Consumer)

B2B2C

Marketplace

Curated showcase

Sell-through

Buyback

LTV (Lifetime Value)

CAC (Customer Acquisition Cost)

Commission

Average ticket

NPS (Net Promoter Score)

BuyBox

Fee

White label (private label)

Creator commerce

Curation

Common vocabulary mistakes

Confusing “isolated” with “better”. Isolated is a type; Quality depends on origin and process, not just category.

Use “absorption” and “bioavailability” as synonyms. They are related but not identical.

Calling everything “anabolic”. Food supplements are not anabolic. Using the correct term preserves credibility.

Saying “cure” in any context. Supplements do not cure disease; phrase like that is illegal.

Confuse RDC with law. RDC is a regulatory resolution; law is another level.

Use “sell-through” instead of “sale” unnecessarily. Jargon helps when appropriate; piling on nonsense alienates the reader.

Key Takeaway Points

• Glossary organizes 4 families: product, technical, regulation, business
• Serves as a quick reference, not as decoration
• Update every 6-12 months
• Translating for students has more value than reciting terms
• Mastering vocabulary elevates professional authority

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Additional reading:

• Creatine monohydrate: evidence-based guide
• Brazil supplements market 2026
• Authority on supplementation without being a nutritionist

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This glossary is kept up to date by the Mega Suplementos team. Suggest additional terms or updates via the newsletter.