Month: June 2021

Topical vitamin C is a science-backed, dermatologist-favorite ingredient that may help slow early skin aging, prevent sun damage, and improve the appearance of wrinkles, dark spots, and acne. Vitamin C is an antioxidant, meaning it fights harmful free radicals (toxins) that come in contact with your skin from external sources like air pollution, or from inside the body as a result of normal processes like your metabolism. Free radicals can damage the skin, and applying topical vitamin C can combat free radicals and may improve the skin’s overall appearance.

Skin benefits of vitamin C

A few clinical studies have demonstrated that vitamin C can improve wrinkles. One study showed that daily use of a vitamin C formulation for at least three months improved the appearance of fine and coarse wrinkles of the face and neck, as well as improved overall skin texture and appearance.

Vitamin C may also help protect the skin from harmful ultraviolet rays when used in combination with a broad-spectrum sunscreen. Clinical studies have shown that combining vitamin C with other topical ingredients, namely ferulic acid and vitamin E, can diminish redness and help protect the skin from long-term damage caused by harmful sun rays.

Further, vitamin C can reduce the appearance of dark spots by blocking the production of pigment in our skin. In clinical trials, the majority of the participants applying topical vitamin C had improvement in their dark spots with very little irritation or side effects, but more studies are needed to confirm the brightening effects of vitamin C.

Additionally, topical vitamin C can help with acne through its anti-inflammatory properties that help control sebum (oil) production within the skin. In clinical trials, twice-daily application of vitamin C reduced acne lesions when compared to placebo. While no serious side effects were reported with vitamin C use in any of these studies, it is important to note that there are only a handful of clinical trials that have studied the effects for vitamin C, and more studies are needed to confirm the findings presented here.

Where to find topical vitamin C and what to look for on the label

Vitamin C can be found in serums or other skincare products. Different formulations of vitamin C can alter its strength and effects in the skin. Consider purchasing vitamin C products from your dermatologist’s office or a verified online retailer, with a clinical formulation that contains an active form of vitamin C (for instance, L-ascorbic acid), has a strength of 10% to 20%, and a pH lower than 3.5, as this combination has been studied in clinical trials. This information can be obtained from the manufacturer’s website under the ingredients section.

Who shouldn’t use Vitamin C products?

Vitamin C has only been studied in adults and is not recommended for children. Always read the ingredient list before purchasing a vitamin C product. If you have sensitivity or a known allergy to any of the ingredients, consider a patch test or consult your doctor before use. If you have acne-prone or oily skin, consider using a formulation that also fights oils, or contains ingredients like salicylic acid that fight breakouts.

How to use topical Vitamin C

During your morning skincare routine

• use a gentle cleanser
• apply a few drops of a vitamin C serum to the face and neck
• apply moisturizer and sunscreen.

You may experience a mild tingling sensation with the use of vitamin C. You may choose to begin applying it every other day, and if tolerated you may apply it daily. It may take up to three months of consistent use to see a noticeable improvement. If you experience substantial discomfort or irritation, please stop using vitamin C and consult with your physician.

Vitamin C does not replace the use of sunscreen or wearing sun-protective clothing. Be sure to use broad-spectrum, tinted sunscreen daily, and limit sun exposure during peak hours.

Follow Dr. Nathan on Twitter @NeeraNathanMD
Follow Dr. Patel on Twitter @PayalPatelMD

For years, products containing acetaminophen, such as the pain reliever Tylenol, were largely viewed as safe to take during pregnancy. Hundreds of widely available over-the-counter remedies, including popular cold, cough, and flu products, contain acetaminophen. Not surprisingly, some 65% of women in the US report taking it during pregnancy to relieve a headache or to ease an aching back.

But recently, a group of doctors and scientists issued a consensus statement in Nature Reviews Endocrinology urging increased caution around acetaminophen use in pregnancy. They noted growing evidence of its potential to interfere with fetal development, possibly leaving lingering effects on the brain, reproductive and urinary systems, and genital development. And while the issue they raise is important, it’s worth noting that the concerns come from studies done in animals and human observational studies. These types of studies cannot prove that acetaminophen is the actual cause of any of these problems.

An endocrine disruptor

Acetaminophen is known to be an endocrine disruptor. That means it can interfere with chemicals and hormones involved in healthy growth, possibly throwing it off track.

According to the consensus statement, some research suggests that exposure to acetaminophen during pregnancy — particularly high doses or frequent use — potentially increases risk for early puberty in girls, or male fertility problems such as low sperm count. It is also associated with other issues such as undescended testicles, or a birth defect called hypospadias where the opening in the tip of the penis is not in the right place. It might play a role in attention deficit disorder and negatively affect IQ.

Risks for ill effects are low

If you took acetaminophen during a current or past pregnancy, this might sound pretty scary — especially since you’ve probably always considered this medicine harmless. But while experts agree it’s important to consider potential risks when taking any over-the-counter or prescription medicines during pregnancy, you shouldn’t panic.

“The risk for an individual is low,” says Dr. Kathryn M. Rexrode, chief of the Division of Women’s Health, Department of Medicine at Harvard-affiliated Brigham and Women’s Hospital.

Chances are pretty good that if you took acetaminophen during a pregnancy, your baby likely did not, or will not, suffer any ill effects.

The research on this topic is not conclusive. Some information used to inform the consensus statement was gathered from studies on animals, or human studies with significant limitations. More research is needed to confirm that this medicine is truly causing health problems, and to determine at what doses, and at what points during a pregnancy, exposure to acetaminophen might be most harmful.

Sensible steps if you’re pregnant

Three common-sense steps can help protect you and your baby until more is known on this topic:

• Avoid acetaminophen during pregnancy when possible. Previously during preconception and pregnancy counseling, Dr. Rexrode had warned patients against using NSAID drugs, such as Advil and Aleve, and suggested taking acetaminophen instead. “Now I also tell people that some concerns have been raised about acetaminophen use during pregnancy, and explain that its use should be limited to situations where it is really needed,” says Dr. Rexrode. In short, always consider whether you really need it before you swallow a pill.
• Consult with your doctor. Always clear acetaminophen use with your doctor, particularly if you are going to be using the medicine for a long period of time. They might agree that taking it is the best option — or suggest a safer alternative.
• Minimize use. If you do need to take acetaminophen during pregnancy, take it for the shortest amount of time possible and at the lowest effective dose to reduce fetal exposure. “This advice about the lowest necessary dose for the shortest period of time is generally good counseling for all over-the-counter medication use, especially during pregnancy,” says Dr. Rexrode.

While all of this is good advice for using acetaminophen, there are times when it’s riskier not to take it. For example, if you have a high fever during pregnancy — which can harm your baby — acetaminophen may be needed to bring your fever down. Provided it’s advised by your doctor, the benefits of acetaminophen use in this case outweigh the potential risks.

In science, advances are a daily occurrence, but true breakthroughs are rare. What does it take to achieve world-changing scientific breakthroughs? Some are the result of a lucky accident, combined with curiosity: scientists traveling down one road suddenly find reason to veer onto another road, one they never planned to travel — a road that may well lead nowhere.

Other major breakthroughs stem from scientists pursuing a very specific dream. One day, usually early in their career, they get an idea that they can’t stop thinking about. It’s crazy, they say to themselves, but is it really impossible? They talk to respected colleagues who often remind them of all the reasons their idea might not work, and how damaging this could be for their career. It’s a sobering message, yet the idea won’t die. So, they scramble to find financial support and seek out colleagues willing to risk traveling that road with them — a road that may well lead nowhere. But sometimes the road leads to major breakthroughs like penicillin and mRNA vaccines.

Breakthroughs due to lucky accidents and curiosity

One day in 1928, Dr. Alexander Fleming at St. Mary’s Hospital in London was growing bacteria in a laboratory dish. Fleming was not pursuing a scientific dream. He was a microbiologist, just doing his job.

Then he noticed something odd: overnight, another kind of microbe, a fungus, had traveled through the air, landed on the laboratory dish, and started to grow and spread on the dish where the bacteria were growing. Fleming soon noticed that the growing fungus seemed to be killing the bacteria. He surmised that it was making some substance that killed the bacteria. Because the name of the fungus was Penicillium rubens, he called the substance the fungus was making “penicillin.”

When Fleming published a paper about his discovery, few were interested. It took another 10 years before other scientists tried to generate large amounts of penicillin to see if it might be able to cure bacterial infections and save lives. We all know how that worked out.

Fleming’s scientific breakthrough, like some others, occurred not because Fleming had a brilliant idea and exclaimed “Eureka!” Instead, it occurred because he noticed something and said, “That’s odd,” and then tried to figure it out.

Breakthroughs due to persistence and resilience in pursuit of a dream

The story of mRNA vaccines, like the Pfizer/BioNTech and Moderna vaccines for COVID-19, is very different from the story of penicillin. For 30 years, a small group of scientists believed that mRNA vaccines would have great advantages over traditional vaccines — if only several obstacles could be overcome. Many of these scientists gave up as they encountered those obstacles, but a few persisted and, ultimately, succeeded. (I described what mRNA vaccines are, how they work, and how obstacles were overcome in a previous blog post.)

One scientist, Dr. Katalin Karikó, joined the faculty of the University of Pennsylvania in the early 1990s with the dream of creating an mRNA vaccine. She applied for grants to support her work, but was repeatedly rejected: the reviewers stated that it was so unlikely that she or anyone could overcome the obstacles that supporting her research would be a wasted investment. Her university only agreed to continue supporting her work if she accepted a demotion and a pay cut. She accepted both, and doggedly pursued her dream.

One major obstacle to mRNA vaccines particularly fascinated her: the violent reaction of the immune system when it encounters mRNA from a virus. Ten years of dogged work helped Karikó and her colleague Drew Weissman figure out how to make a small change in mRNA that prevented that violent immune response — a major step in making all mRNA vaccines possible. Without this, the world wouldn’t have mRNA COVID vaccines today.

Two other scientists who created the Pfizer/BioNTech COVID vaccine, Uğur Şahin and Őzlem Turëci, are Turkish immigrants to Germany who met, fell in love with the idea of creating an mRNA vaccine, and then fell in love with each other. According to The Wall Street Journal, one day in 2002 they took a break for lunch, got married, and then returned in the afternoon to their laboratory to finish an experiment — just one more among many conducted over 30 years. Each experiment was one more possible step toward their ultimate dream until finally, in 2020, they achieved that dream: their mRNA vaccine for COVID-19 proved to be very safe and effective.

Holding hard to their dreams

Whichever path scientists who achieve lifesaving breakthroughs travel, they often endure disinterest, like Fleming, or repeated skepticism, ridicule, and rejection, like Karikó, Weissman, Şahin, and Turëci. Only through sheer persistence did these scientists bring their dreams to life. They have been rewarded with fame and wealth and something even more valuable: the knowledge that because of their work hundreds of millions of people around the world never got sick, and millions never died before their time.

Of course, a relentless obsession with an improbable dream fails to pay off for many scientists. Their ideas, while quite brilliant, in the end are proved wrong: nature doesn’t turn out to operate the way they predicted. In the end, their beautiful theory is murdered by a brutal gang of facts.

Still other scientific dreamers ultimately prove to have been on the right track all along and would have achieved their dream — if only they had done the experiment a little differently, if only they had persisted a little longer, or if only the support for their work had not run out. As a result, neither they nor the rest of us benefitted from what would have been — until other scientists rediscovered their work years later.

Ultimately, scientific breakthroughs are possible only if a society is willing to invest in dreamers, recognizing that not all investments will lead to major breakthroughs. However, the investments that do lead to breakthroughs bring an economic return that is far greater than the investment — as well as preventing suffering and death and changing the world.

Want to participate in COVID-19 research? Download the COVID Symptom Study app to help researchers track symptoms and hot spots across the US. Click here for information.