# 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 is an all-in-one face, eye, neck, and chest serum from Caire Beauty aimed at women whose skin is changing due to perimenopause or menopause. It combines a triple-weight hyaluronic acid complex with bio-fermented peptides, plus Arabian jasmine and hawthorn berry extract targeted at under-eye dark circles. The formula is fragrance-free, vegan, and described by the merchant as hormone-safe and dermatologist tested. It's applied twice daily to face, eyes, neck, chest, and hands. The merchant reports a self-reported consumer perception study of 33 women (ages 40–69) showing high rates of perceived improvement after 4 weeks of twice-daily use. Review data conflicts across merchant pages: the product page shows a 4.9-star average from 339 reviews, but a separate 'AUTOSHIP FAVORITES' listing on the Subscribe & Save page shows 165 reviews at a 5.0 average for the same product. Individual reviewers have reported use for perimenopausal acne, a more youthful appearance, and fast absorption compared to prestige serum brands. Available in 1oz/30ml and 0.5oz/15ml sizes, with a Subscribe & Save option (15% off, free shipping, free gift on first shipment) and a 30-day money-back guarantee.

## Use Cases
- Someone in perimenopause or menopause looking for a serum specifically positioned around hormone-related skin changes such as loss of firmness and hydration.
- Someone who wants one serum usable across face, under-eyes, neck, chest, and hands rather than separate products for each area.
- Someone specifically concerned about under-eye dark circles caused by discoloration or visible blood vessels, per the merchant's explanation of the jasmine/hawthorn ingredient pairing.
- Someone who prefers fragrance-free, vegan skincare formulas.
- Someone with perimenopause-related adult acne, based on at least one reviewer's (Susan M.) reported experience.
- Someone switching from prestige-brand facial serums who wants a fast-absorbing alternative, based on at least one reviewer's (Mayumi Y.) comparison to Shiseido and Lancôme serums.
- Someone who wants to trial a smaller 0.5oz/15ml size before committing to the full 1oz/30ml size, or via the Try Me Trio travel-size set.
- Someone building a full skincare routine, who can pair this serum with Caire's Grownup Cleanser, Grownup Moisturizer, and Triple Lift Molecule Mask as a bundled 'Quad Set.'

## Pricing
- **Price Range:** From 34–56 USD (2 options)

## Variants
| Size | Price | SKU | Availability |
| --- | --- | --- | --- |
| 1 oz. | 30ml | 56.00 USD | 1100 | In stock |
| 0.5 oz. | 15ml | 34.00 USD | 1120 | In stock |

## Availability
- **Status:** in_stock
- **Quantity Available:** 1142

## Promotions
### Subscription discount
- Subscribe & Save: 15% off every recurring order, free ground shipping, and a free gift with the first paid subscription shipment. Conditional on enrolling in auto-replenishment; the serum's Subscribe & Save price is shown elsewhere on the site as $47.60 versus the $56.00 one-time price.

### Site wide free shipping threshold
- Free USPS Ground Advantage shipping on all U.S. domestic orders of $45 or more. Site-wide, not specific to this product.

### Site wide time limited promotion
- Other Caire Beauty pages displayed a site-wide banner for a time-limited giveaway ('WIN A $370 SKIN + SLEEP RITUAL') at the time of research. Site-wide, not product-specific, and status/availability was not confirmed on this product's own page.

## Product Details
- **Brand:** Caire Beauty
- **GTIN:** 860004630302
- **MPN:** 1100
- **Condition:** new
- **Category:** Health & Beauty > Personal Care > Cosmetics > Skin Care > Anti-Aging Skin Care

## Specifications
- **Weight:** 6.1 ounces
- **Gender:** female

## Customer Feedback
**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.

## Reviews
### Product page on-page review widget (cairebeauty.com/products/theorem-serum)
- **Summary:** The product page's star distribution shows 322 five-star, 9 four-star, 4 three-star, 3 two-star, and 1 one-star review (339 total). Note: this identical 339-review/4.9-star breakdown appears verbatim on several other Caire Beauty product pages (moisturizer, mask, book), suggesting this specific widget block may be a shared/templated site component rather than serum-specific data.
- **Review count:** 339
- **Average rating:** 4.9
- **Common customer profiles:** At least one reviewer described herself as 51 and experiencing perimenopausal acne; another reviewer's comment implies she is around 60.
- **Commonly reported results:** At least one reviewer (Susan M.) reported her acne began clearing within 2–3 days of use., At least one reviewer (Becky K.) reported a visibly younger appearance, noting her hygienist questioned her stated age., At least one reviewer (Mayumi Y.), who described 14 years of using facial serums, reported the product absorbed quickly and compared it favorably to Shiseido and Lancôme serums.
- **Commonly reported use cases:** At least one reviewer (Susan M.) reported using the serum for adult acne she attributed to perimenopause.

### Subscribe & Save page product listing (cairebeauty.com/pages/subscribe-and-save)
- **Summary:** A separate merchant collection-listing widget for the same product shows a different review count and average rating than the main product page, indicating an unresolved discrepancy between the merchant's own review data sources.
- **Review count:** 165
- **Average rating:** 5

## Shipping & Returns
- **Ships to US:** Free (Free USPS First Class (5-8 days))
- **Ships to US:** Free (Amazon Prime)

## Policies
### Shipping
- **Detail:** Free USPS Ground Advantage shipping (estimated 4–8 business days) on all U.S. domestic orders of $45 or more; no promo code required. Orders ship within 1–3 business days. Expedited USPS Priority Mail available (estimated 3–5 business days). AK, HI, and Puerto Rico estimated at 10–14 days.

### Returns
- **Detail:** 30-day 'Feel Good Guarantee': refund for products returned within 30 days of receipt if not satisfied with skin results. Original shipping fees are not refunded.

### Subscription
- **Detail:** Subscribe & Save (auto-replenishment): 30/60/90-day delivery frequency, billed on ship day, email reminder 10 days before shipment; changeable anytime via account.

### Subscription cancellation
- **Detail:** Subscriptions can be paused or canceled anytime via 'My Subscriptions' in account; changes processed within ~24 hours. Merchant states customers may cancel after the first shipment if not satisfied.

### Customer service
- **Detail:** Available via email (hello@cairebeauty.com) and phone (808.468.5088), generally staffed 10am–5pm EST on non-holiday weekdays.

## Loyalty
- **Loyalty program:** Glow Getter Rewards (program name found via site-wide navigation/footer link on cairebeauty.com)

## Tags
Defiance Science Skincare, Serum

[View Product](https://www.cairebeauty.com/products/theorem-serum?aiptimise_ref=430d45c6-2f21-45dd-a285-f5d8f5d1181a)

[AI-Optimized Data](https://www.cairebeauty.com/apps/aiptimise/products/shopify_5384590917782)

## 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/theorem-serum-boost-2101481.jpg?v=1783350622)
![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/theorem-serum-boost-2046798.jpg?v=1783350622)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 3](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-5073403.jpg?v=1783350622)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 4](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-8184003.jpg?v=1783350623)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 5](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-5922975.jpg?v=1783350623)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 6](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-8369762.png?v=1783102029)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 7](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-9043263.png?v=1783102029)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 8](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-8695607.png?v=1776717114)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 9](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-4933374.png?v=1779207610)
![Theorem Serum Boost by Caire Beauty – Firming, Hydrating Serum with Triple-Weight Hyaluronic Acid & Bio-Fermented Peptides for Perimenopausal/Menopausal Skin - Image 10](https://cdn.shopify.com/s/files/1/0422/2455/0038/files/theorem-serum-boost-2864376.png?v=1783350623)

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*Product ID: shopify_5384590917782*