Write Compliant Supplement Descriptions with AI

Tested prompts for how to write supplement product descriptions compared across 5 leading AI models.

BEST BY JUDGE SCORE Claude Haiku 4.5 8/10

The prompt we tested

You are an expert supplement copywriter specializing in FDA and FTC compliant product descriptions for dietary supplements. Write a product description for the supplement described below.

Follow these instructions carefully:
Write in a warm, confident, benefit-focused tone at roughly 150-220 words, using short scannable sentences and second-person voice. Use only FDA/FTC-compliant structure/function claims (e.g., 'supports,' 'helps promote,' 'contributes to'), never disease or treatment claims, and end with the disclaimer: 'These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.'

Product details:
Product: Ashwagandha Calm Gummies. Contains 600mg KSM-66 ashwagandha root extract per serving, plus L-theanine and magnesium glycinate. Target audience is stressed professionals aged 25-45 who want a natural way to unwind without drowsiness. Sugar-free, vegan, third-party tested.

Structure the output with: (1) a compelling headline, (2) a 2-3 sentence hook paragraph, (3) a 'Key Benefits' bulleted list using compliant language, (4) a 'What's Inside' section highlighting key ingredients and their traditional/studied roles, (5) suggested use, and (6) a short trust-building closing line. Avoid disease claims, avoid words like 'cure,' 'treat,' 'prevent,' or 'diagnose,' and use structure/function language instead (e.g., 'supports,' 'helps maintain,' 'promotes'). Include a standard DSHEA-style disclaimer at the end.

Model comparison

ModelQualityCostLatencyTokens
Claude Opus 4.7 8 $0.0505 9.2s 566 / 560
Claude Haiku 4.5 8 $0.0020 4.4s 388 / 332
GPT-5.4 8 $0.0056 12.4s 337 / 315
Grok 4.1 Fast Reasoning 7 $0.0002 7.1s 480 / 221

Outputs

Claude Opus 4.7 8/10
# Ashwagandha Calm Gummies
### Unwind Without the Wind-Down

Your inbox never sleeps—but that doesn't mean your nervous system should run on overdrive. Our Ashwagandha Calm Gummies deliver a clinically studied blend designed to help you shift from "always on" to effortlessly composed. No drowsiness. No crash. Just steady, focused calm.

### Key Benefits
- **Helps support** a healthy response to everyday stress
- **Promotes** a sense of calm and mental clarity
- **Helps maintain** balanced mood and relaxation without sedation
- **Supports** restful sleep quality when taken in the evening
- **Contributes to** sustained energy and focus throughout busy days

### What's Inside
- **KSM-66® Ashwagandha Root Extract (600mg):** The most researched form of ashwagandha, traditionally used in Ayurveda as an adaptogen to help the body adapt to daily stressors.
- **L-Theanine:** An amino acid from green tea studied for its role in promoting relaxed alertness and calm focus.
- **Magnesium Glycinate:** A highly bioavailable form of magnesium that supports muscle relaxation and nervous system balance.

### Suggested Use
Chew two gummies daily, anytime you need to reset. For evening wind-down, take 30–60 minutes before bed.

### Our Promise
Sugar-free, vegan, and third-party tested for purity and potency—because your calm deserves clean ingredients.

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.*
Judge notes: Nearly production-ready with strong compliance and structure, but "clinically studied blend" in the hook slightly overpromises without qualification, and "Supports restful sleep quality" edges toward a claim that could raise FTC scrutiny without supporting substantiation language.
Claude Haiku 4.5 8/10
# Ashwagandha Calm Gummies: Unwind Without the Fog

Modern work demands a lot from you. You need a way to ease tension and find your calm—without the grogginess that comes with other relaxation products. Ashwagandha Calm Gummies deliver potent, clinically studied support in a delicious, convenient form.

## Key Benefits

- **Supports relaxation** and helps you manage everyday stress
- **Promotes mental clarity** so you stay sharp while you unwind
- **Helps maintain a balanced mood** throughout your day
- **Sugar-free & vegan**—clean nutrition that fits your lifestyle
- **No drowsiness**—perfect for afternoon use or before important meetings

## What's Inside

Each serving contains 600mg of KSM-66® ashwagandha root extract, a premium form traditionally used to support stress resilience and emotional balance. We've paired it with L-theanine, an amino acid that helps promote calm focus, and magnesium glycinate, which supports healthy relaxation and muscle function. Together, these ingredients work synergistically to help you feel grounded, not sedated.

## Suggested Use

Take one gummy daily, or as directed by your healthcare practitioner.

**Quality You Can Trust:** Third-party tested for purity and potency.

---

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.*
Judge notes: Excellent compliance and structure throughout, but "clinically studied support" in the hook slightly oversteps into implied clinical efficacy claims that an FTC-cautious editor would flag before production use.
GPT-5.4 8/10
**Find Your Calm, Stay Sharp**

When your day is nonstop, you need support that helps you unwind without slowing you down. Ashwagandha Calm Gummies are made for busy professionals who want a natural, feel-good way to support calm, focus, and everyday balance.

### Key Benefits
- **Supports a calm, balanced mood** during times of everyday stress  
- **Helps promote relaxation without drowsiness**  
- **Supports mental focus and clarity** so you can stay present  
- **Contributes to a healthy stress response** with clinically studied KSM-66® ashwagandha  
- **Helps support nervous system and muscle relaxation** with highly absorbable magnesium glycinate  

### What’s Inside
**KSM-66® Ashwagandha Root Extract – 600 mg per serving**  
A premium, full-spectrum ashwagandha root extract traditionally used to support resilience, calm, and overall well-being.

**L-Theanine**  
An amino acid known for helping promote a relaxed yet alert state, making it ideal for daytime calm.

**Magnesium Glycinate**  
A gentle, well-tolerated form of magnesium that helps support relaxation, nerve function, and everyday stress balance.

### Suggested Use
Take as directed on the label, preferably as part of your daily wellness routine.

Sugar-free, vegan, and third-party tested for added peace of mind.

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
Judge notes: The output is production-ready and fully compliant, but the "Suggested Use" section is generic ("Take as directed on the label") rather than providing specific suggested use language tied to the product format (gummies), which would add real value for a professional copywriting deliverable.
Grok 4.1 Fast Reasoning 7/10
### Unwind Effortlessly with Ashwagandha Calm Gummies

You juggle deadlines, meetings, and endless to-dos. You crave a natural way to relax and recharge—without the midday fog. Discover Ashwagandha Calm Gummies: your delicious, sugar-free ally for everyday calm.

**Key Benefits**
- Supports relaxation and a balanced mood
- Helps promote stress adaptation and resilience
- Contributes to restful unwinding without drowsiness

**What's Inside**  
Each serving delivers 600mg KSM-66® ashwagandha root extract, a clinically-studied form from Ayurveda traditionally used to support vitality and stress response. Paired with L-theanine to promote calm focus and magnesium glycinate to support muscle and nervous system relaxation. Sugar-free, vegan, and third-party tested for purity.

**Suggested Use**  
Take 2 gummies daily, anytime you need a moment of calm.

Trust the clean, effective formula pros rely on.  

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.*
Judge notes: The output is production-usable and fully compliant, but the "What's Inside" section blends ingredients into a run-on paragraph rather than cleanly differentiating each ingredient's role, and the closing trust line ("Trust the clean, effective formula pros rely on") feels generic and underdelivers on the trust-building potential requested.

Related queries