AI Testimonial Scripts for Magnesium Supplements: Per-Claim Wording

Magnesium is the supplement with the most authorised health claims in the UK and EU register, which makes the over-claim trap subtle. Brands assume the breadth of the register gives them latitude. It does not. Each authorised claim has a specific wording the ASA accepts, and the AI video tools default to phrasings that go a sentence beyond the wording. The gap is the difference between an account that scales and one that gets reported.

Magnesium also crosses three distinct marketing positions: muscle, sleep, and stress. Each carries different authorised claims and different over-claim risks. A single magnesium glycinate product can be advertised through any of the three angles legally; the script has to be different for each.

What follows is the working pattern for magnesium-category AI testimonial scripts, including the seven authorised claims and the prompt structures that hold model output inside them.

The seven authorised claims for magnesium

The retained EU register lists seven authorised claims for magnesium under Commission Regulation 432/2012:

• Contributes to a reduction of tiredness and fatigue
• Contributes to electrolyte balance
• Contributes to normal energy-yielding metabolism
• Contributes to normal functioning of the nervous system
• Contributes to normal muscle function
• Contributes to normal protein synthesis
• Contributes to normal psychological function

The product has to provide a "significant amount" of magnesium (15% of NRV per 100g, or per portion if labelled per portion) for any of these claims to apply. The script has to use the authorised wording, or wording the ASA accepts as having the same meaning.

"Calms a busy mind" maps to "contributes to normal psychological function" closely enough that the ASA accepts it. "Cures my anxiety" does not. The compliance line is between functional support and treatment.

Form-specific positioning vs ingredient-level claims

Magnesium glycinate, citrate, malate, threonate, and oxide each have distinct positioning in the DTC market. Glycinate carries the relaxation and sleep angle, citrate the digestion angle, malate the energy angle, threonate the cognitive angle (contested in the literature, not authorised on the register), and oxide the cheap-bulk angle.

The authorised claims attach to magnesium the mineral, not the form. A magnesium glycinate product can use the muscle-function claim. A magnesium oxide product can use the same claim. Marketing positioning in the script can lean on the form's reputation, but the claim wording has to come from the magnesium register, not from form-specific evidence that lacks authorisation.

This is the structural detail that AI video tools miss. Briefed with "magnesium glycinate testimonial, sleep angle", the model will reach for "knocks me out", "deep sleep", "no more insomnia", because the form's reputation in the wellness community supports those framings. The register does not.

Where AI tools default to over-claim

A vanilla magnesium brief produces over-claim output across all current models. The pattern is consistent: AI tools elevate "contributes to normal" claims into "fixes" or "cures" framings within the script's first sentence.

The negative-constraint instruction is what brings output into the envelope. A brief that includes "use only authorised-claim wording, do not promise outcomes, do not use the words cure, fix, treat, eliminate, or stop" reduces the over-claim rate substantially. It does not eliminate it. Each output still requires review against the seven-claim register before it ships.

Sleep-positioned magnesium specifically overlaps with the sleep supplement category covered in AI testimonial videos for sleep supplements, where the same constraint pattern applies with a different ingredient register.

Three testimonial script patterns

These are simplified working briefs, not legal advice.

Pattern 1, magnesium glycinate, evening relaxation framing

Female late-30s, low-light bedroom interior, evening, casual loungewear. Holding a glass of water and the magnesium bottle. Talks about how she takes magnesium glycinate as part of an evening routine that helps her wind down. References that magnesium contributes to normal psychological function, using the authorised wording. Mentions she still uses other relaxation practices alongside it. Avoids any claim about treating insomnia, anxiety, or stress disorders. Tone is reflective.

Pattern 2, magnesium citrate, post-training muscle framing

Male early-30s, in a kitchen post-workout, gym kit. Holding a shaker. Talks about cramping during long training blocks and adding magnesium to support normal muscle function, using the authorised wording. References that he takes it daily, not just on training days. Avoids any claim about eliminating cramps, curing muscle pain, or replacing electrolyte products. Tone is practical, slightly dry.

Pattern 3, magnesium malate, fatigue/energy framing

Mid-40s woman, at a desk in a home office, mid-afternoon. Working through a heavy week. Talks about taking magnesium with breakfast and how the form she uses contributes to a reduction of tiredness and fatigue, using the authorised wording. References that adequate sleep and hydration matter more than any supplement. Avoids any claim about boosting energy, beating burnout, or replacing caffeine. Tone is measured.

The pattern is consistent across all three. The script names the authorised claim explicitly, attaches it to the relevant cofactor, and constrains the surrounding language to functional support rather than outcome claims.

Cost framing

Magnesium is one of the higher-volume DTC supplement categories. The 12 to 25 variants per month required for sustained Meta performance translates to creator costs between £4,000 and £18,000 monthly at typical wellness-category creator rates. AI generation at the same volume is £50 to £200 per month through a vertical-aware platform.

The category-specific note: magnesium is well-suited to AI generation because the brief patterns are highly templatised across the seven authorised claims. The same negative-constraint structure works for muscle, sleep, fatigue, and stress framings. Brands building a claim-allowlist library for magnesium typically reach a state where the per-variant manual review takes under three minutes.

For the broader UGC cost comparison across supplement verticals, see AI generated UGC for supplement brands.

Cinematography notes per form

Each marketing position requires a different visual register. Glycinate sleep ads need the soft-light interior and lived-in bedroom set. Citrate muscle ads need the post-workout kitchen with mixer bottle visualisation; the same liquid-physics caveat that applies to protein powder applies here, briefing the bottle as already mixed produces more reliable output. Malate energy ads need the home office or desk environment.

AI video models handle all three with reasonable competence, but the sleep register is the most demanding cinematographically. Underlit interiors are where the cheaper hooks-tier models, Hailuo and Kling, produce more visible artefacts. Veo 3.1 and Sora 2 Pro are the safer picks for hero placements in the sleep position.

FAQ

How many of the seven authorised magnesium claims can a single ad use?

Multiple, if the script supports each one with a relevant context. In practice, single-claim scripts perform better on Meta than multi-claim scripts, and the compliance review is faster. Most efficient operators run separate variants for separate claims.

Can the script say "magnesium glycinate" specifically?

Yes. Naming the form is acceptable. The authorised claims attach to magnesium, so naming the form does not change the claim envelope, and the form's positioning (sleep, muscle, energy) is acceptable as long as the script does not attribute outcomes specific to the form that lack authorisation.

What about the cognitive-function claim through magnesium threonate?

Threonate is a form of magnesium that has been associated with cognitive function in marketing copy, but no authorised health claim applies specifically to threonate. The general magnesium claim "contributes to normal psychological function" is the closest authorised wording. Marketing threonate as cognitively superior to other forms is a frequent ASA-trigger.

Does the ASA review magnesium ads more aggressively than vitamin ads?

Slightly less, in current observation. Vitamin ads are reviewed more frequently because the consumer base is broader and the over-claim surface is wider. Magnesium-specific complaints typically attach to sleep-positioned products, where the line into sleep-disorder territory is the trigger. The vitamin-category equivalent is covered in AI video ads for vitamin brands.

How does the brand structure the brief library for ongoing variant testing?

Most efficient operators maintain a library of three to five approved scripts per claim, each with two to three visual treatments. The variant test cycle picks combinations across the library rather than briefing fresh each time. The compliance review converges on a per-variant time of two to three minutes, and the brief discipline becomes operational rather than creative.

For the FTC framework that US-market magnesium ads operate inside, see FTC compliance for supplement ads in 2026.

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