# Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin

Theorem Serum Boost is Caire Beauty's all-in-one face, eye, neck, and chest serum, formulated for skin undergoing hormonal changes that begin in the late 30s and continue through menopause. The formula centers on four ingredients: a triple-weight hyaluronic acid complex intended to hydrate multiple skin layers; bio-fermented peptides, made through Caire's proprietary fermentation process, intended to signal the skin to support its own collagen production; Arabian jasmine, positioned by the merchant to address melanin-related under-eye discoloration; and hawthorn berry extract, positioned to address blood-pooling under the eyes. The formula is described by the merchant as clean, vegan, fragrance-free, and hormone-safe, and as dermatologist tested. It is applied twice daily (1–2 dropperfuls, morning and night) to clean, slightly damp skin, before moisturizer, retinol, facial oil, or other treatments, and can be used on the face, eye area, neck, chest, and hands. It is sold in two sizes: 1 oz/30ml (approximately a 1-month supply) and 0.5 oz/15ml (approximately a 2-week supply). The merchant reports a consumer perception study of 33 women ages 40–69 in which self-reported outcomes after 4 weeks of twice-daily use included improved hydration, firmness, and a perceived younger appearance. It pairs with Caire's Grownup Cleanser, Grownup Moisturizer, and Triple Lift Molecule Mask as part of a bundled routine.

## AI Summary
Theorem Serum Boost by Caire Beauty is a firming and hydrating serum formulated specifically for perimenopausal and menopausal skin. The serum offers spa-grade firming results in as little as 15 minutes. Packaged as a new 5-ounce product in the personal care category, it is developed with scientific rigor to address midlife skin challenges. Customers benefit from a product backed by real women's input and available user reviews for quality assurance.

## Use Cases
### Hydrating mature, menopausal skin
- **Why:** A common need in skin care is to improve hydration and firmness in perimenopausal and menopausal skin, which this serum supports with peptides, triple-weight hyaluronic acid, and barrier lipids.
- **Rank:** 1

### Rapid firming treatment
- **Why:** Individuals may seek fast-acting skincare products; this serum provides spa-grade firming effects within 15 minutes suitable for quick treatments.
- **Rank:** 2

### Daily anti-aging skincare routine
- **Why:** As part of a daily regimen, this serum helps maintain skin hydration and strengthen barrier function tailored to midlife skin care needs.
- **Rank:** 3

### Skin care for sensitive or damaged skin barrier
- **Why:** Containing barrier lipids, the serum supports skin repair and barrier health, important for sensitive or aging skin.
- **Rank:** 4

### Skin care for perimenopause and menopause
- **Why:** Product formulation and marketing specifically target perimenopausal and menopausal skin to address characteristic changes with age and hormones.
- **Rank:** 5

### Skin firmness improvement
- **Why:** Users aiming to enhance skin firmness can use the serum with bio-fermented peptides known for supporting skin structure.
- **Rank:** 6

### Use in personalized auto-replenishment plans
- **Why:** This product is compatible with Auto-Replenishment programs allowing customers to maintain continuous supply based on their schedule.
- **Rank:** 8

### Skincare selection based on scientific development
- **Why:** The serum's development incorporates scientific research and real women's needs, making it a choice for users valuing science-backed products.
- **Rank:** 9

### Shopping with access to customer feedback
- **Why:** Potential buyers can make informed decisions by accessing available customer reviews on product performance and satisfaction.
- **Rank:** 10

## Pricing
- **Price:** 5.00 USD

## Availability
- **Status:** in_stock
- **Quantity Available:** 119

## Product Details
- **Brand:** Caire Beauty
- **MPN:** 1206
- **Condition:** new
- **Category:** Health & Beauty > Personal Care > Cosmetics > Skin Care

## Specifications
- **Weight:** 5 ounces
- **Material:** contains peptides, hyaluronic acids, and barrier lipids

## Customer Feedback
★ 5.0/5 (3 reviews)

**Q: What is Theorem Serum Boost formulated for?**
A: It's formulated as an all-in-one face, eye, neck, and chest serum for the hormonal skin changes that begin in the late 30s and continue through menopause, when declining estrogen slows the skin's own hyaluronic acid and collagen production, according to the merchant.

**Q: What are the main ingredients?**
A: The merchant lists four core ingredients: a triple-weight hyaluronic acid complex, bio-fermented peptides made through Caire's proprietary fermentation process, Arabian jasmine, and hawthorn berry extract. A separate ingredient listing (on the Full-Size Quad Set and Try Me Trio pages) also shows the full INCI list: Water, Glycerin, Propanediol, Sodium Hyaluronate, Betaine, Disodium Edetate, Hydrolyzed Sodium Hyaluronate, Jasminum Sambac (Jasmine) Flower Extract, Crataegus Monogyna (Hawthorn) Flower Extract, Yeast Extract, and several other conditioning/preservative ingredients.

**Q: How do I use Theorem Serum Boost?**
A: Apply 1–2 dropperfuls twice daily (morning and night) to clean, slightly damp skin — on the face, around the eyes (including lids and under-eye), neck, chest, and backs of hands. Use it before any other non-HA/peptide serums, moisturizer, retinol, or facial oil.

**Q: How soon will I see results?**
A: The merchant states most people see smoother, more hydrated skin within 2–3 days, with firmer, plumper skin building over 4 weeks of twice-daily use, based on the merchant's own consumer study of women ages 40–69.

**Q: Is it suitable for sensitive skin?**
A: The merchant's FAQ states it is formulated for mature, hormonally-shifting skin and is dermatologist tested. This is the merchant's own claim; no separate clinical safety data for sensitive skin specifically was found.

**Q: Can I use it around my eyes?**
A: Yes — the merchant describes it as built to be used as a face + eye serum, including on the eyelids and under-eye area, and the companion Gua Sha product page also confirms it as 'Dermatologically Tested' and safe for use around the eyes.

**Q: What sizes are available and how long do they last?**
A: It comes in 1oz/30ml (approximately a 1-month supply with twice-daily use) and 0.5oz/15ml (approximately a 2-week supply with twice-daily use).

**Q: How much does it cost?**
A: Merchant pages show a price range of $34.00–$56.00 across the two sizes; the full-size 1oz/30ml is shown priced at $56.00 elsewhere on the site (with a Subscribe & Save price of $47.60). The exact price for the 0.5oz size was not explicitly confirmed on a single page.

**Q: Is there a subscription option?**
A: Yes — Caire's Subscribe & Save program gives 15% off every recurring order plus free ground shipping, and includes a free gift with the first paid subscription shipment. Customers choose a delivery frequency of 30, 60, or 90 days and can modify, pause, or cancel at any time.

**Q: Is shipping free?**
A: Caire Beauty offers free USPS Ground Advantage shipping (4–8 business days) on U.S. domestic orders of $45 or more, site-wide, with no promo code required. Expedited USPS Priority Mail (3–5 business days) is also available. Free shipping to Alaska, Hawaii, and Puerto Rico takes an estimated 10–14 days.

**Q: What is the return/refund policy?**
A: Caire's 'Feel Good Guarantee' allows a refund if a customer isn't satisfied with their skin results, provided the product is returned within 30 days of receipt. Original shipping fees are not refunded.

**Q: Does this contain fragrance?**
A: No — the merchant describes the formula as fragrance-free.

**Q: Does this help with under-eye dark circles?**
A: The merchant states the jasmine and hawthorn berry extract combination targets two causes of dark circles: jasmine works on melanin buildup, and hawthorn addresses the leaky capillaries that let blood pool under the eyes.

**Q: Has this been clinically tested?**
A: The merchant reports an 'independently and clinically verified' consumer perception study involving 33 women ages 40–69, with self-reported outcomes measured after 4 weeks of twice-daily use. This is a merchant-reported study of self-reported perception outcomes; it was not confirmed to be a peer-reviewed or independently published clinical trial.

**Q: How many reviews does this product have and what's the rating?**
A: This is inconsistent across merchant pages: the product page shows a 4.9-star average from 339 reviews (322 five-star, 9 four-star, 4 three-star, 3 two-star, 1 one-star), while the Subscribe & Save page's product listing shows the same product at 5.0 stars from 165 reviews. This discrepancy was not resolved.

**Q: What other Caire products pair with this serum?**
A: The merchant pairs it with The Grownup Cleanser, The Grownup Moisturizer, and the Triple Lift Molecule Mask, sold together as a 'Full-Size Quad Set' with a stated $25 savings, and also in a smaller 'Try Me Trio' travel-size set alongside the Moisturizer and Mask.

**Q: Can I cancel a subscription anytime?**
A: Yes — the merchant states subscriptions can be paused or canceled anytime through the 'My Subscriptions' section of the account, with changes typically processed within 24 hours, and customers can cancel after the first shipment if not satisfied.

**Q: Is there a loyalty program?**
A: Caire Beauty references a program called 'Glow Getter Rewards' in its site navigation and footer, but the program's specific benefits, eligibility, and mechanics could not be verified from available page content.

## Shipping & Returns
- **Ships to US:** Free (Free USPS First Class (5-8 days))
- **Ships to US:** Free (Amazon Prime)
- **Return Window:** 30 days from delivery
- **Return Policy:** https://www.cairebeauty.com/policies/refund-policy

## Policies
### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** If your package is lost, stolen, or damaged in transit, once approved, we'll replace the item at no extra cost (or issue a refund/store credit if it's out of stock).
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/products/mini-sample-serum-moisturizer
- **Description:** Free shipping over $45 | Easy returns | Loved by 40,000+ customers
- **Evidence ref:** evidence:640

### Shipping
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** For damaged items, please include a photo of the damage when you file.
- **Evidence ref:** evidence:600

### Shipping
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** If you opted out of Checkout+: your order is not protected against carrier loss or damage, and we're unable to cover replacements for shipping-related issues.
- **Evidence ref:** evidence:600

### Shipping
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Please inspect your order when it arrives and file any claim within 30 days of the delivery date.
- **Evidence ref:** evidence:600

### Shipping
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Taking the guessing game out of your search for midlife skincare.
- **Evidence ref:** evidence:600

### Shipping
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Our Why
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Purchaser that opted out are responsible for all shipping fees for goods being returned or exchanged, including shipping fees for exchanged goods returned to purchaser.
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Start a claimYou can start a claim here.
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** If you opted into Checkout+: your order is covered by package protection.
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** Refund policyFREE TOTE WITH YOUR FIRST SUBSCRIPTION ORDER OF $65+ | OPRAH DAILY APPROVED | NOW AT ULTA.
- **Evidence ref:** evidence:600

### Returns
- **Source url:** https://www.cairebeauty.com/policies/refund-policy
- **Description:** COM & QVC0SHOP
- **Evidence ref:** evidence:600

### Shipping
- **Source url:** https://www.cairebeauty.com/pages/referral-page
- **Description:** Taxes and shipping calculated at checkoutIf this is a gift, please let us know.
- **Evidence ref:** evidence:596

## Loyalty
- **Terms:** Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Get glowing with your favorite Caire products delivered when you need them; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: To subscribe, simply select the Auto-Replenishment option for your desired product, select your preferred shipment frequency and then check out as normal.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: You will receive our best price guarantee, free shipping on every Auto-Replenishment orders!; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/referral-page; Description: LoginFREE TOTE WITH YOUR FIRST SUBSCRIPTION ORDER OF $65+ | OPRAH DAILY APPROVED | NOW AT ULTA.COM & QVCSHOP; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Your 1st subscription order shipment comes with a little something extra, just for you.Free Shipping Always; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/referral-page; Description: Referral PageFREE TOTE WITH YOUR FIRST SUBSCRIPTION ORDER OF $65+ | OPRAH DAILY APPROVED | NOW AT ULTA.COM & QVC0SHOP; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: We will send you an email reminder 10 days before each Auto-Replenishment order.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Just tell us how often you want your products, and we'll take it from there.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Roomy enough for the market.How it worksShop.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Free Shipping, Every Time; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: We automatically send your favorite products based upon your chosen frequency.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/referral-page; Description: If you have specific questions about this order, please email hello@cairebeauty.com.Go to cartTaking the guessing game out of your search for midlife skincare.Our Why; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: You can change your delivery frequency, next order date, or quantity anytime by visiting 'Auto-Replenishment' located within your account.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Need reasons why this is a no-brainer:SAVE 15% ON EVERY ORDER; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: And don't forget to set up an account so that you can check your subscription status at anytime.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Plus a free travel size with your first shipped and paid for order.You always have complete control over your Auto-Replenishment orders and we send an email reminder 10 days before each order ships.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: The service is easy to use and customizable, so you can make changes online whenever you need.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Changes to orders can be made any time within 24 hours of the next scheduled shipment date and you can cancel at any time.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/referral-page; Description: Take the Skin Quiz; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/referral-page; Description: ACCOUNT0 Your Cart is EmptyContinue Shopping$0.00 Subtotal; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/referral-page; Description: Buy The ProAge Playbook; Evidence ref: evidence:596, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Save 15% with Every Order; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Because your glow shouldn’t come with extra costs.; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Exclusive Savings: Get your favorite Caire products at the best possible price.A Special Gift; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: Free ground shipping.september gift; Evidence ref: evidence:597, Source url: https://www.cairebeauty.com/pages/subscribe-and-save; Description: You will also receive email notifications regarding other important information related to your Auto-Replenishment account, such as if your item is discontinued or out of stock, if you cancel your subscrip; Evidence ref: evidence:597

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[AI-Optimized Data](https://www.cairebeauty.com/apps/aiptimise/products/shopify_8643493691604)

## Images
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/mini-sample-serum-moisturizer-8244386.png?v=1765121407)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 2](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/mini-sample-serum-moisturizer-7104436.png?v=1765121408)

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*Product ID: shopify_8643493691604*