Tried & Graded

Eighth Day Regenerative Serum

No study we could find.

Eighth Day’s Regenerative Serum is sold with a patented “Peptide-rich Plasma” and 24 actives, developed by a dermatologic surgeon, to address 10 visible signs of skin aging. Short answer: we found no study of the serum or of “Peptide-rich Plasma” on PubMed.

How the evidence flows

Flowchart for this page: each claim, the studies that tested it and what they found, and the grade that follows. The same studies and grades are listed in full below.

Each claim (middle), the studies that tested it (left) — green found it, red found nothing — and the grade they add up to (right). Drawn from the same records as the grades below. Tap to open full size.

Eighth Day Regenerative Serum · evidence checked 2026-10-27

What the research shows

Grades are calculated from the studies listed, by fixed rules.

  • Eighth Day’s Regenerative Serum, with “Peptide-rich Plasma”, addresses 10 visible signs of skin agingNo real evidence
    The ad said
    “The Regenerative Serum addresses 10 visible signs of skin aging with our highest concentration of Peptide-rich Plasma® and 24 bioidentical actives, developed by dermatologic surgeon Dr. Antony…”

    Eighth Day · Facebook ad, seen Oct 2026

    We found no study of the serum or of “Peptide-rich Plasma” on PubMed. A patent and a surgeon’s name are not evidence that a product works.