The Method

A synergistic blend of antioxidants, stem cells, and peptides that defends skin from free radicals and environmental stressors, including the visible effects of GLP-1, related volume and elasticity loss. This potent complex reinforces the skin’s resilience, helping maintain a youthful, radiant, and healthy appearance for all skin journeys.

Key Ingredients

15% Vitamin C Blend, Ferulic Acid, Resveratrol, Vitamin E, Fulvic Acid Trace Mineral Complex, Hyaluronic Acid, Acai Stem Cells, Triple Peptide Complex.

Please Note: Due to the high concentration of L-ascorbic acid, natural oxidation may cause color changes over time. This is normal and does not compromise safety or effectiveness. For best results, use within four months of opening.

Full Ingredients

Distilled Water, Ethoxydiglycol, L-ascorbic acid, Laureth-23, Glycerin, Ferulic acid, Triethanolamine, Polyacrylate cross polymer-6, Tetrahexyldecyl ascorbate, 3-glyceryl ascorbate, Magnesium ascorbyl phosphate, Acai stem cells (Euterpe Oleracea Fruit Extract), Alpha tocopherol, Triple peptide complex (Prunus amygdalus dulcis almond seed extract, Yeast extract, Hydrolyzed wheat protein), Phenoxyethanol, Sorbic acid, Xanthan gum, Sodium hyaluronate, Resveratrol, Sodium benzoate, Tetrasodium glutamate diacetate, Fulvic acid trace mineral complex.

How to Use

Shake the product well for optimal results. After cleansing, apply .5 (half dropper) to a dry face, neck, and chest, once in the morning and once at night.

Warm gently between fingertips and press into skin. Use with The Moisturizer for maximum barrier + elasticity repair.

When You'll See Results

Many users see visible glow and plumping in 7, 10 days. Full structural support and brightness improvements appear in 30, 60 days with consistent use. Patience pays.

Longevity Hybrid Defense Serum

Multi pathway external defense + renewal, built for skin in the GLP-1 journey. Five interconnected pillars: defend, protect, hydrate, renew, firm. Not one hero ingredient.

$47.00 $55.00 30 ml / 1 fl oz
  • Helps areas that look deflated or hollow appear fuller
  • Brightens the look of dull, uneven tone
  • Supports the skin barrier
  • Helps skin look firmer + more resilient

Purchase options

Quantity

Billed monthly · cancel anytime

  • Free shipping on orders over $100
  • Formulated for GLP-1 patients

Real Results

Measured on real skin, documented up to 180 days

Unretouched photos from our 90-day beta cohort using the two-step protocol, taken in natural light by real participants.

Before / After Study participant
After 90 days of consistent use

Study participant

Before / After Study participant
After 90 days of consistent use

Study participant

Before / After Study participant
After 90 days of consistent use

Study participant

Day 1Under-eye area on day 1, before use
Day 30Under-eye area on day 30, after consistent use
After 30 days of consistent use

Improved under-eye texture

Beta participant

Inside Out by Design

The Five Pillar Defense + Renewal System

We do not support the drug. We support the person on the drug.

5.0
Rated 5.0 out of 5 stars
Based on 49 reviews
Total 5 star reviews: 49 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
Slide 1 selected
49 reviews
  • SM Profile picture for Sara M.
    Sara M.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    My skin felt more hydrated, smoother, and more consistent

    “Noticing how quickly my face seemed to age, after starting a GLP-1, I began seeing fine lines, uneven tone, and a tired look that concerned me. Within the first few weeks of using the serum, I started noticing improvements in my skin’s texture and overall tone. My skin felt more hydrated, smoother, and more consistent, and when I looked in the mirror, I could see a healthier, more youthful appearance.

    Over just a month, the changes became more noticeable — fewer fine lines, improved texture, and a brighter overall look. Even my under-eye area and facial contours appeared slightly fuller. What impressed me most is that I have extremely sensitive skin and experienced zero irritation, even with twice-daily use.

    The routine is fast, simple, and easy to maintain despite my busy schedule, and seeing real improvement so quickly makes me excited to continue.”

  • AL Profile picture for Angela L.
    Angela L.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    What surprised me most was how quickly it absorbed

    “After starting GLP-1 and going through perimenopause at the same time, I began noticing changes in my skin that honestly scared me — real wrinkles, dullness, dryness, and lines that didn’t disappear when my face relaxed. I was worried I would look in the mirror and no longer recognize myself as I lost weight.

    I had never used a serum before, so I didn’t know what to expect, but within weeks I began to notice a difference. My fine lines began smoothing out, and even the deep line in the middle of my forehead became noticeably less pronounced — something I truly didn’t think was possible. My skin looks brighter, more even, and dewy without makeup.

    What surprised me most was how quickly it absorbed and how silky my skin felt afterward. I catch myself touching my face throughout the day because it feels so smooth. As someone on GLP-1 who wanted to protect my skin from aging too fast, this serum has helped me feel like I’m keeping the youthful skin I didn’t want to lose.”

  • MC Profile picture for Meg C.
    Meg C.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    Within a short period of time, I saw a clear improvement in my skin’s texture and overall plumpness

    “I’ll be honest — I’m naturally skeptical of skincare that isn’t pharmaceutical grade. My routine has always been extremely disciplined, so I did not expect to be as impressed as I was. After losing 40 pounds on a GLP-1, I began noticing deeper nasolabial folds and a loss of glow that affected my confidence.

    Within a short period of time, I saw a clear improvement in my skin’s texture and overall plumpness. Most notably, the depth of my nasolabial folds — my biggest skin concern — visibly decreased, and my under-eye wrinkles began to improve as well. My skin felt softer, more hydrated, and noticeably more ‘bouncy.’

    Even more surprising was how much calmer my skin looked. Breakouts resolved faster than usual, redness diminished, and my complexion appeared healthier overall. As someone deeply loyal to my previous regimen, I did not anticipate these results — but after 30 days, I can genuinely say I’m a true believer.”

  • SD Profile picture for Scott D.
    Scott D.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    My deeper crow’s feet looked smoother

    “After losing about 45–50 pounds on a GLP-1, I started noticing the typical ‘weight-loss face’ — hollow, tired, and less full than it should look. Within the first two weeks of using the serum, I noticed a tighter feel and a smooth glow, and it looked like my wrinkles were already starting to shrink.

    By the fourth week, the skin around my eyes had tightened, smaller lines had disappeared, and even my deeper crow’s feet looked smoother. My freckles and age spots also began to lighten, giving my face and neck a more balanced tone. What surprised me most is that my face, which had started to cave in from weight loss, now looks normal and fuller again.

    As a mid-50s man who never followed a skincare routine—bar soap was about it—this completely changed how my skin looks and feels. My face feels fresh, tighter, and healthier, and I honestly think I look younger and feel more confident.”

  • IE Profile picture for Ivet E.
    Ivet E.
    Verified Reviewer
    I recommend this product
    Rated 5 out of 5 stars
    5 months ago
    I would absolutely recommend it to anyone experiencing facial aging or volume changes from weight loss

    “After starting a GLP-1 and noticing how quickly my face seemed to age, my skin looked more tired, less plump, and overall older than I expected in such a short time. Within just a few weeks of using the serum, I began seeing real changes — my face looked smoother, more youthful, and noticeably lifted, with fewer fine lines than before.

    When I look in the mirror now, I see a more youthful version of myself. My skin feels softer, less dry, and healthier overall, and my makeup sits more smoothly. What impressed me most is how effective the routine has been without causing any irritation.

    Seeing this level of improvement so quickly has made me excited to continue, and I would absolutely recommend it to anyone experiencing facial aging or volume changes from weight loss.