Side Effects of Mushroom Coffee: What to Consider Before You Try It

Mushroom coffee, a blend of medicinal mushrooms and coffee, is known for its health benefits, but what are the side effects of mushroom coffee?

While generally mild, some negative side effects of mushroom coffee include digestive issues, allergic reactions like rashes, and potential interactions with medications. For some, mushroom coffee may cause diarrhea or trigger an allergic reaction.

Understanding these risks can help you make informed decisions. Read on to explore the side effects of mushroom coffee , or jump to specific concerns like allergies and digestive discomfort below.

Mushroom coffee is still pretty new to the market and can refer to any number of concoctions containing mushrooms, some that do contain actual coffee and some that don't. 

It may mean a mushroom extract blended with real coffee, or it could refer to whole, dry, powdered mushrooms that are flavored to taste like regular coffee. Or, truly, it could refer to any concoction in between.

Mushroom coffee is most commonly consumed for its potential benefits, which may include:

• Increased energy levels

• Immune boosting effects

• Improved focus

• Cognition support

• Improved neurogenesis

• Antioxidant boost

• Mood support

You can learn more about these benefits by reading “ Benefits of Mushroom Coffee (& Quality Standards That Matter) ”

Keep in mind that the side effects and health profile of every product will differ based on its individual ingredients, but we are going to base our advice in this article on what we consider a “standard” mushroom coffee–one that contains a blend of the most common medicinal mushrooms (either extract or whole powder) and real coffee.

Therefore, our risk factors take into account both the risks associated with medicinal mushrooms and with the caffeine found in coffee products.

Although the side effects of mushroom coffee can vary based on the types and quantities of mushrooms used, most mushroom coffee blends combine several types of mushrooms. This reduces the risk of overconsumption of any one mushroom, lowering the likelihood of experiencing significant side effects.

Also, the methods used to make mushroom coffee can affect its potency and potential side effects, which is why quality manufacturing processes are crucial.

If you're concerned about the specific side effects of mushroom coffee, such as digestive discomfort or allergic reactions like rashes, you can learn more about the potential risks in the next section. Here, we also cover the most common side effects of mushroom coffee and the risk factors for an allergy to mushroom coffee.

If your mushroom coffee formula has a high caffeine content, similar to regular coffee, you may be at risk for jitteriness or increased anxiety. This is, unfortunately, one of the most common side effects of caffeine. If you’re sensitive to caffeine or already experience high anxiety levels, you may choose a mushroom coffee with low caffeine content.

Caffeine can increase heart rate, though the effect is usually temporary. This is usually only worrisome when you overconsume caffeine or if you have certain risk factors, like high blood pressure or other cardiovascular issues.

Some people experience nausea or a nervous stomach from caffeine alone, sometimes as a side effect of increased anxiety. Mushrooms can add to this risk factor, especially when the product contains a whole mushroom powder, which usually contains a high fiber content similar to the mushroom itself.

Coffee stimulates colonic activity, which, when combined with the high fiber content of a whole mushroom powder, may cause loose stools for some people.

Some mushrooms have a high oxalate content which may increase the risk of developing kidney stones. However, you need to consume large amounts of oxalates on a regular basis for this to be a serious risk, unless you are already prone to kidney stones for some other reason. Consuming too little liquid can also increase this risk.

Mushrooms allergies are rare, but allergic reactions can be severe. Allergic reactions to mushrooms are an immune system response and should not be ignored. Signs of an allergic reaction to mushrooms may include:

• Swelling of the lips, mouth, and airways

• Difficulty breathing

• Skin rashes or hives

• Runny nose

• Watery eyes

• Nausea and vomiting

• Stomach cramping

• Bloating

• Loose stools

The most common medicinal mushrooms used in mushroom coffee include Reishi, Lion’s Mane, Cordyceps, Tremella, and Maitake. These mushrooms are all considered to be safe for most people, though some rare side effects do exist (based mostly on anecdotal reports).

Lion’s Mane is known as the “mind mushroom” thanks to its benefits surrounding cognition and neuroprotection. 

This mild flavored mushroom is considered a delicacy in some cuisines, but consuming large amounts of the whole mushroom (or an extracted, concentrated version) may be associated with some side effects, like:

• Headache

• Reduced Libido

• Difficulty Breathing

• Skin Rashes

• Blood Pressure Changes

Tremella, the “beauty mushroom” helps protect tissues and promote hydration inside and out. This mushroom is known as a “yin tonic,” or a concoction that can help to improve moisture and energy (blood) flow in the body. 

Very few side effects are known, but some that are common to all mushrooms may apply to Tremella, including:

• Nausea

• Upset Stomach

Cordyceps is known as the “athlete's mushroom,” but it can provide energy and stamina support for everyday life. This mushroom is known for its ability to stimulate oxygen flow throughout the body which may be linked to an array of physical benefits. 

Some possible side effects may include:

• Nausea

• Upset Stomach

• Stool Changes

The Maitake mushroom is a powerful adaptogen, meaning it may "adapt" to the body's needs in order to resolve imbalances that cause various mental and physical challenges. It’s most well-known for its immune-regulating benefits, but may have some mild or rare side effects, including:

• Reduced blood pressure

• Digestive upset

Reishi is a functional mushroom known for its potential adaptogenic effects. Some sources suggest that it’s been used to balance energy flow, circulation, sleep, and stress for centuries by herbal practitioners. 

Reishi has not been linked to any severe side effects outside of allergic reactions in people with a mushroom allergy, but in rare cases, other side effects could apply, including:

• dry mouth

• Itchiness

• skin rash

• upset stomach

• Nausea

Shiitake mushrooms are known for their immune-supportive and heart-healthy properties, containing beta-glucans and lentinan compounds that may boost wellness. 

Generally safe, shiitake can occasionally cause mild side effects, especially in high doses or extract form, including:

• Skin rash ( Shiitake dermatitis )

• Upset stomach

• Diarrhea

• Bloating

• Allergic reactions in sensitive individuals

Most people tolerate shiitake well, but those with mushroom allergies or gastrointestinal sensitivities should exercise caution.

Many people hear the term “medicinal mushrooms” and immediately think of psilocybin mushrooms. These are the “magic mushrooms” known for their intense psychedelic effects. While psilocybin is currently being researched as a medicinal based on its potential to help treat mood disorders, it is still a controlled substance in the U.S.

The legal mushroom coffee products on the market do not contain psilocybin and will not induce psychedelic effects. None of the most common medicinal mushrooms we listed above will induce any psychedelic effects.

We mentioned that mushroom coffee is not psychedelic–and it also has no mind-altering effects that may make it unsafe. For most people who do not have a mushroom allergy, a high-quality mushroom coffee formula is safe to use daily.

In most studies, medicinal mushroom extracts are well tolerated both by humans and animals. There are some potential side effects associated with medicinal

The most significant risk associated with a mushroom coffee product for most people is the risk of getting a low-quality product. You may come across products that are not made using safe extraction techniques or that are contaminated during the manufacturing process.

It’s important to choose a manufacturer who uses a cGMP-compliant manufacturing facility and a third-party testing regimen to ensure the quality of the products you purchase.

We mentioned that mushrooms have been used medicinally for thousands of years–but so has coffee. Both mushrooms and coffee have undeniable health benefits, and the right blend of these wholesome ingredients may be just the pick-me-up you’re after.

Coffee has powerful antioxidants and can benefit heart health, metabolism, and more. Mushrooms are known to have various adaptogenic and nootropic benefits that may work, with or without coffee, to boost cognition, memory, focus, energy, and more.

Mushrooms contain plenty of vitamins and minerals, including:

• B Vitamins (B2, B3, B5, and folate)

• Selenium

• Phosphorus

• Copper

• Potassium

• Vitamin D

Mushrooms also contain bioactive compounds that may help to regulate immune functions, support a healthy stress response, and boost overall vitality. The compounds include:

• Polysaccharides . Polysaccharides are carbohydrates that act as prebiotics. Beta-glucans, one form of polysaccharides, are abundant in mushrooms and are known to have a wide range of potential health benefits.

• Carotenoids. Carotenoid compounds are antioxidants that can benefit heart health and prevent neurodegeneration.

• Indoles . Indoles also display antioxidant activity and can sometimes interact with the hormone system.

• Polyphenols . Polyphenols have been shown to have anti-aging and anti-inflammatory properties.

Find out the benefits of Mushroom Coffee by reading our article “ Benefits of Mushroom Coffee (& Quality Standards That Matter) ”

Most people can take mushroom formulas without complication. However, some people may be at additional risk when using some mushroom coffee formulas. Some experts advise against medicinal mushroom supplementation for the following people:

• Those with bleeding disorders

• Diabetics

• Those with immune system disorders

• Those expecting surgery in the next two weeks

• Anyone with a thyroid disorder

• Anyone taking blood pressure medication

• Those who are pregnant or breastfeeding

There are many brands of mushroom coffee on the market, but not all are made equally. If you want a mushroom coffee that offers all of the medicinal benefits of functional mushrooms, look for a product that uses a mushroom extract from 100% fruited bodies.

Make sure it’s made according to Good Manufacturing Practice (GMP) guidelines and lab tested to prove potency.

Our Lucid Mushroom Coffee is made from 100% organic coffee grown, roasted, and imported from Colombia. Then we added a potent extract made from the fruited bodies of four powerful mushrooms–Cordyceps, Lion’s Mane, Tremella, and Maitake. Finally, we mixed in a blend of nootropics like BCAA’s, L-Theanine, L-Tyrosine, Ginkgo Biloba, and more.

This functional formula can help boost your performance, improve immunity, support healing, and more–a slew of benefits that most energy drinks and coffee blends just don’t provide. When it’s all said and done, this nootropic + mushroom super blend adds up to offer these benefits:

• Increases endurance

• Improves athletic performance

• Helps to manage fatigue

• Boosts immunity

• Improves neurogenesis

• Enhances focus, learning, and memory

• Supports a healthy stress response

• Promotes relaxation

• Supports a balanced mood

Want to learn more? Read more about our  Ingredients and Quality , or check out one of our three delicious formulas.

Individuals with mushroom allergies, pregnant or breastfeeding women, and those on certain medications should avoid mushroom coffee unless advised otherwise by a healthcare professional. Always consult your doctor before starting any new supplement.

Yes, mushroom coffee can be beneficial. It combines the antioxidants and energy-boosting properties of coffee with the potential health benefits of medicinal mushrooms, such as enhanced cognitive function, improved immune support, and reduced inflammation.

The side effects of mushroom coffee are typically mild and rare but may include digestive discomfort, allergic reactions, and interactions with medications. It's important to start with a small dose to gauge your body's response.

Side effects of Lion's Mane mushroom coffee are usually minimal but can include stomach upset, skin rash, or allergic reactions in sensitive individuals. Consult a healthcare professional if you experience any adverse effects.

People with mushroom allergies, individuals taking blood-thinning medications, and those with low blood pressure should avoid using Lion's Mane without medical advice. Pregnant and breastfeeding women should also consult a doctor before use.

Lion's Mane is generally considered safe for the liver and may even have liver-protective properties. However, individuals with pre-existing liver conditions should consult a healthcare provider before incorporating it into their routine.

Mushroom coffee may aid in weight loss by boosting metabolism and providing a sustained energy release, which can help with increased physical activity. However, it should be part of a balanced diet and exercise plan for effective weight management.

Most mushroom coffee blends contain caffeine from real coffee beans, although the amount can vary. Some products are formulated to be caffeine-free, combining mushrooms with other coffee-like ingredients to provide an energy boost without caffeine.

Yes, many people report improved mental clarity and focus after drinking mushroom coffee. This is often attributed to the nootropic effects of certain medicinal mushrooms like Lion's Mane and Cordyceps, which can enhance cognitive function.

1. Dr. Rachita Narsaria, M.D, “Mushroom Allergy” https://www.medindia.net/health/conditions/mushroom-allergy.htm

2. “A characteristic rash caused by Shiitake mushrooms – An emerging concern?” https://pmc.ncbi.nlm.nih.gov/articles/PMC8222744/