Does it actually help me lose weight?

Not directly. Indirectly: restored energy → more sport sessions sustained. Deep sleep → lowered cortisol → reduced abdominal storage. Active mitophagy → better cellular metabolism. Synergistic with moderate caloric deficit + regular activity.

When should I start to be ready for July vacation?

Ideally between May 15 and June 1 for results by late July. After June 15, you'll get internal effects (energy, sleep) but not complete skin transformation.

How is this different from US brands like Tally Health or Timeline?

Three verifiable differences: (1) Novel Food EU compliance, (2) Public HPLC COAs accessible via URL pattern /coa/{lot}, (3) French GMP manufacturing with EU sourcing traceability. Same brand-name actives (Mitopure, Magtein, AstaReal) but EU-compliant packaging and dosing per ANSES guidelines.

Refund if I see no results at day 56?

Yes — 90-day satisfaction guarantee with no conditions. Standard policy on subscription and one-shot. The 90-day window largely covers the 8-week evaluation period.

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Summer Body Longevity Stack 2026: French RCT-Validated Protocol (NMN, Urolithin A, Magtein)

Publié le 01/06/2026 · par VEXTA Lab Editorial

Why 8 weeks before summer, not 2

Most visible body transformations rely on cellular renewal, which follows fixed biological cycles. Epidermis renews entirely in 28 days. Cutaneous collagen (responsible for firmness) in 60-90 days. Muscle mass in 12 weeks. No supplement cheats these cycles — what we can do is optimize them.

An 8-week protocol overlaps with: 2 complete epidermal renewal cycles + 1 collagen remodeling cycle + 60 days of NAD+ restoration (Yamane 2023, Nutrients) + stable mitochondrial activation (Singh ATLAS 2022, Cell Reports Medicine).

Week 1-2: cellular kickoff

NMN (500 mg/day) restores NAD+ pools, central coenzyme of ATP energy production. Yamane et al. 2023 (Nutrients, DOI 10.3390/nu15041079) measured +50% blood NAD+ at 8 weeks with 500 mg/day in n=80 subjects. Perceived effects day 5-10: more stable morning energy, deeper sleep. No visible glow yet, that's normal.

Week 3-6: visible transformation kicks in

Astaxanthin (AstaReal 8 mg/day) reaches stable plasma concentrations after 14 days and deploys its anti-glycation and photoprotective effect. Multiple RCTs document measurable improvement in skin elasticity and hydration at 8 weeks with minimum 4 mg/day.

Urolithin A (Mitopure 500 mg/day) activates mitophagy. Singh et al. 2022 study (n=88 adults aged 40-65) showed +12% knee extension force + improved plantar endurance in 4 months at 500 mg/day vs placebo.

Week 7-8: summer-ready body

At day 56, you measure. Before/after photos comparable. For men: waist circumference (-2 to -4 cm typical in moderately overweight subjects without major dietary change). For women: skin elasticity, complexion homogeneity, deep sleep quality.

Magnesium L-threonate (Magtein 2000 mg/day) has completed its nighttime work: Liu et al. 2016 showed measurable improvement in sleep architecture at 12 weeks. Restored deep sleep = reduced morning cortisol = stabilizing body composition.

Why a French longevity brand?

VEXTA Lab is France's first longevity stack formulated to RCT pivotal doses. Three differentiators vs US/UK brands:

Novel Food EU compliance: Magtein (2024), Ergothioneine (2017), Mitopure (EU 2021) — all officially authorized in the European Union
Public HPLC COAs per batch: every lot shipped includes URL /coa/{lot} with full chromatographic analysis
French GMP manufacturing: real EU traceability, no relabeling from non-EU sourcing

How to order from outside France

Currently shipping to mainland France only during pilot phase. EU shipping opening Q3 2026. UK shipping Q4 2026 pending post-Brexit Novel Food clarification. International waitlist: join the priority list to be notified when your country opens.

Sources

Questions fréquentes

For skin (complexion, glow): 4-6 weeks. For waist (stable body composition, excluding major dietary change): 6-8 weeks. For subjective energy and sleep: 5-10 days. Before/after photos at day 1 and day 56 = most reliable comparison.

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