Many of us have done countless rapid antigen tests (RATs) over the course of the pandemic. Testing ourselves at home has become second nature.

But there’s also a growing worldwide market in medical tests sold online directly to the public. These are “direct-to-consumer” tests, and you can access them without seeing a doctor.

While this might sound convenient, the benefits to most consumers are questionable, as we discovered in a recent study.

What are direct-to-consumer tests?

Let’s start with what they’re not. We’re not talking about patients who are diagnosed with a condition, and use tests to monitor themselves (for example, finger-prick testing to monitor blood sugar levels for people with diabetes).

We’re also not talking about home testing kits used for population screening, such as RATs for COVID, or the “poo tests” sent to people aged 50 and over for bowel cancer screening.

Direct-to-consumer tests are products marketed to anyone who is willing to pay, without going through their GP. They can include hormone profiling tests, tests for thyroid disease and food sensitivity tests, among many others.

Some direct-to-consumer tests allow you to complete the test at home, while self-collected lab tests give you the equipment to collect a sample, which you then send to a lab. You can now also buy pathology requests for a lab directly from a company without seeing a doctor.

What we did in our study

We searched (via Google) for direct-to-consumer products advertised for sale online in Australia between June and December 2021. We then assessed whether each test was likely to provide benefits to those who use them based on scientific literature published about the tests, and any recommendations either for or against their use from professional medical organisations.

We identified 103 types of tests and 484 individual products ranging in price from A$12.99 to A$1,947.

We concluded only 11% of these tests were likely to benefit most consumers. These included tests for STIs, where social stigma can sometimes discourage people from testing at a clinic.

A further 31% could possibly benefit a person, if they were at higher risk. For example, if a person had symptoms of thyroid disease, a test may benefit them. But the Royal Australian College of General Practitioners does not recommend testing for thyroid disease in people without symptoms because evidence showing benefits of identifying and treating people with early thyroid disease is lacking.

Some 42% were commercial “health checks” such as hormone and nutritional status tests. Although these are legitimate tests – they may be ordered by a doctor in certain circumstances, or be used in research – they have limited usefulness for consumers.

A test of your hormone or vitamin levels at a particular time can’t do much to help you improve your health, especially because test results change depending on the time of day, month or season you test.

Most worryingly, 17% of the tests were outright “quackery” that wouldn’t be recommended by any mainstream health practitioner. For example, hair analysis for assessing food allergies is unproven and can lead to misdiagnosis and ineffective treatments.

More than half of the tests we looked at didn’t state they offered a pre- or post-test consultation.

Products available may change outside the time frame of our study, and direct-to-consumer tests not promoted or directly purchasable online, such as those offered in pharmacies or by commercial health clinics, were not included.

But in Australia, ours is the first and only study we know of mapping the scale and variety of direct-to-consumer tests sold online.

Research from other countries has similarly found a lack of evidence to support the majority of direct-to-consumer tests.

4 questions to ask before you buy a test online

Many direct-to-consumer tests offer limited benefits, and could even lead to harms. Here are four questions you should ask yourself if you’re considering buying a medical test online.

1. If I do this test, could I end up with extra medical appointments or treatments I don’t need?

Doing a test yourself might seem harmless (it’s just information, after all), but unnecessary tests often find issues that would never have caused you problems.

For example, someone taking a diabetes test may find moderately high blood sugar levels see them labelled as “pre-diabetic”. However, this diagnosis has been controversial, regarded by many as making patients out of healthy people, a large number of whom won’t go on to develop diabetes.

2. Would my GP recommend this test?

If you have worrying symptoms or risk factors, your GP can recommend the best tests for you. Tests your GP orders are more likely to be covered by Medicare, so will cost you a lot less than a direct-to-consumer test.

3. Is this a good quality test?

A good quality home self-testing kit should indicate high sensitivity (the proportion of true cases that will be accurately detected) and high specificity (the proportion of people who don’t have the disease who will be accurately ruled out). These figures should ideally be in the high 90s, and clearly printed on the product packaging.

For tests analysed in a lab, check if the lab is accredited by the National Association of Testing Authorities. Avoid tests sent to overseas labs, where Australian regulators can’t control the quality, or the protection of your sample or personal health information.

4. Do I really need this test?

There are lots of reasons to want information from a test, like peace of mind, or just curiosity. But unless you have clear symptoms and risk factors, you’re probably testing yourself unnecessarily and wasting your money.

Direct-to-consumer tests might seem like a good idea, but in most cases, you’d be better off letting sleeping dogs lie if you feel well, or going to your GP if you have concerns.

Patti Shih, Senior Lecturer, Australian Centre for Health Engagement, Evidence and Values, University of Wollongong; Fiona Stanaway, Associate Professor in Clinical Epidemiology, University of Sydney; Katy Bell, Associate Professor in Clinical Epidemiology, Sydney School of Public Health, University of Sydney, and Stacy Carter, Professor and Director, Australian Centre for Health Engagement, Evidence and Values, University of Wollongong

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Sea moss is the latest “superfood” wellness influencers are swearing by. They claim sea moss products – usually in gel form – have multiple health benefits. These include supporting brain and immune function, or protecting against viruses and other microbes.

But do these health claims stack up? Let’s take a look.

What is sea moss?

Sea moss is produced using a kind of seaweed – particularly red algae – that grow in various locations all around the world. Three main species are used in sea moss products:

• Chondrus crispus (known as Irish moss or carrageenan moss)
• Eucheuma cottonii (sea moss or seabird’s nest)
• Gracilaria (Irish moss or ogonori).

Some products also contain the brown algae Fucus vesiculosus (commonly known as bladderwrack, black tang, rockweed, sea grapes, bladder fucus, sea oak, cut weed, dyers fucus, red fucus or rock wrack).

Most sea moss products are sold as a gel that can be added to recipes, used in smoothies, frozen into ice cubes or eaten on its own. The products also come in capsule form or can be purchased “raw” and used to make your own gels at home.

What’s the evidence?

Sea moss products claim a host of potential health benefits, from supporting immunity, to promoting skin health and enhancing mood and focus, among many others.

But is there any evidence supporting these claims?

Recent studies have reviewed the biological properties of the main sea moss species (Chondrus crispus, Eucheuma cottonii, Gracilaria and Fucus vesiculosus).

They suggest these species may have anti-inflammatory, antioxidant, anticancer, antidiabetic and probiotic properties.

However, the vast majority of research relating to Chondrus crispus, Gracilaria and Fucus vesiculosus – and all of the research on Eucheuma cottonii – comes from studies done in test tubes or using cell and animal models. We should not assume the health effects seen would be the same in humans.

In cell and animal studies, researchers usually administer algae in a laboratory and use specific extracts rich in bioactive compounds rather than commercially available sea moss products.

They also use very different – often relatively larger – amounts compared to what someone would typically consume when they eat sea moss products.

This means the existing studies can’t tell us about the human body’s processes when eating and digesting sea moss.

Sea moss may have similar effects in humans. But so far there is very little evidence people who consume sea moss will experience any of the claimed health benefits.

Nutritional value

Eating sea moss does not replace the need for a balanced diet, including a variety of fruits and vegetables.

Chondrus crispus, Eucheuma cottonii and Gracilaria, like many seaweeds, are rich sources of nutrients such as fatty acids, amino acids, vitamin C and minerals. These nutrients are also likely to be present in sea moss, although some may be lost during the preparation of the product (for example, soaking may reduce vitamin C content), and those that remain could be present in relatively low quantities.

There are claims that sea moss may be harmful for people with thyroid problems. This relates to the relationship between thyroid function and iodine. The algae used to make sea moss are notable sources of iodine and excess iodine intake can contribute to thyroid problems, particularly for people with pre-existing conditions. That is why these products often carry disclaimers related to iodine sensitivity or thyroid health.

Is it worth it?

So you may be wondering if it’s worth trying sea moss. Here are a few things to consider before you decide whether to start scooping sea moss into your smoothies.

A 375mL jar costs around $A25–$30 and lasts about seven to ten days, if you follow the recommended serving suggestion of two tablespoons per day. This makes it a relatively expensive source of nutrients.

Sea moss is often hyped for containing 92 different minerals. While there may be 92 minerals present, the amount of minerals in the algae will vary depending on growing location and conditions.

The efficiency with which minerals from algae can be absorbed and used by the body also varies for different minerals. For example, sodium is absorbed well, while only about 50% of iodine is absorbed.

But sea moss has also been shown to contain lead, mercury and other heavy metals – as well as radioactive elements (such as radon) that can be harmful to humans. Seaweeds are known for their ability to accumulate minerals from their environment, regardless of whether these are beneficial or harmful for human nutrition. Remember, more doesn’t always mean better.

What else am I eating?

While you won’t get a full nutritional breakdown on the jar, it is always wise to check what other ingredients you may be eating. Sea moss products can contain a range of other ingredients, such as lime, monk fruit powder, spirulina and ginger, among many others.

These ingredients differ between brands and products, so be aware of your needs and always check.

Despite their health claims, most sea moss products also carry disclaimers indicating that the products are not intended to diagnose, treat, cure or prevent any disease.

If you have concerns about your health, always speak to a health professional for accurate and personalised medical advice.

Margaret Murray, Senior Lecturer, Nutrition, Swinburne University of Technology

This article is republished from The Conversation under a Creative Commons license. Read the original article.