Preparation H can temporarily reduce under-eye puffiness, but it’s not designed for facial skin and carries real risks when used near your eyes. The idea has been floating around beauty circles for decades, and the basic science behind it holds up: the active ingredient in Preparation H constricts blood vessels, which can reduce swelling anywhere on the body, including under the eyes. But the version of the product that originally fueled this trend no longer exists in the United States, and today’s formulations come with concerns worth understanding before you try it.
Why It Might Work
The most common version of Preparation H sold in the U.S. contains phenylephrine, a compound that activates receptors on blood vessel walls, causing them to tighten and narrow. This is the same mechanism that shrinks swollen hemorrhoid tissue. When applied under the eyes, phenylephrine can temporarily constrict the small blood vessels responsible for puffiness and dark circles, making the area look less swollen. Harvard Health Publishing has acknowledged this logic, noting that while high-quality clinical research is lacking, the vasoconstricting action “could reduce the puffiness and darkness under the eyes.”
The key word is “temporarily.” Phenylephrine doesn’t address the underlying causes of eye bags, whether that’s fluid retention, thinning skin, or fat pad changes that come with aging. Any visible improvement fades once the drug wears off, typically within a few hours.
The Formula Has Changed
Much of Preparation H’s reputation as a beauty hack traces back to an older formula that contained an ingredient called live yeast cell derivative (LYCD). This compound was believed to promote skin healing and reduce inflammation in ways that went beyond simple blood vessel constriction. The FDA banned LYCD from hemorrhoid creams in the 1990s because there wasn’t enough evidence to support its safety or effectiveness, even for hemorrhoids.
Today’s U.S. formulations contain either phenylephrine or hydrocortisone as active ingredients. Neither is the same product that beauty insiders were raving about in the 1980s. The original LYCD version is still sold in Canada under the name “Preparation H with Bio-Dyne,” which is why you’ll sometimes see people recommending the Canadian version specifically.
Risks of Using It Near Your Eyes
The skin under your eyes is the thinnest on your entire body, roughly 0.5 millimeters thick. Products formulated for rectal tissue aren’t tested or optimized for this delicate area, and Johns Hopkins Medicine specifically warns that hemorrhoid creams “may cause irritation in this sensitive area” and stresses the importance of keeping the product out of your eyes.
The two active ingredients in current formulations each carry distinct concerns:
- Phenylephrine constricts blood vessels effectively, but systemic absorption near the eyes could contribute to elevated blood pressure, heart palpitations, or other cardiovascular effects. The FDA has documented serious cardiovascular reactions to phenylephrine even in ophthalmic (eye drop) formulations, including rapid heart rate and blood pressure spikes.
- Hydrocortisone is a steroid that reduces inflammation. Used repeatedly on thin facial skin, it can cause the skin to become even thinner over time, worsen visible blood vessels, and potentially raise eye pressure if it migrates into the eye. This is the opposite of what you want for an area that’s already prone to thinning with age.
Occasional, careful use is unlikely to cause serious harm for most people. But making it part of your daily routine introduces cumulative risks that outweigh the brief cosmetic payoff.
Safer Alternatives That Target Puffiness
Caffeine works through the same basic mechanism as phenylephrine: it constricts blood vessels and reduces swelling. Many eye creams are formulated with caffeine specifically for under-eye puffiness, and because they’re designed for facial skin, they include appropriate concentrations and gentler supporting ingredients. Johns Hopkins Medicine recommends caffeine-based eye creams as an alternative, and even suggests resting chilled caffeinated black tea bags on closed eyes as a simple home remedy.
Cold compresses work well for morning puffiness caused by fluid pooling overnight. A chilled spoon, cold washcloth, or gel eye mask held against the area for five to ten minutes can visibly reduce swelling by constricting blood vessels without any chemical risk. Sleeping with your head slightly elevated also helps prevent fluid from settling under your eyes in the first place.
For persistent or worsening eye bags that don’t respond to topical treatments, the cause is often structural: fat pads shifting forward or skin losing elasticity with age. No cream, whether designed for hemorrhoids or eyes, will meaningfully reverse those changes. Cosmetic procedures like filler, laser resurfacing, or lower blepharoplasty (eyelid surgery) are the only options that address the anatomy directly.
The Bottom Line on This Beauty Hack
Preparation H can reduce puffiness under the eyes for a few hours, but the product responsible for its beauty reputation was pulled from U.S. shelves decades ago. Current formulations carry irritation risks, potential for skin thinning with repeated use, and no clinical evidence that they work better than eye creams actually designed for your face. A caffeine-based eye cream or a simple cold compress delivers similar short-term results with far less downside.