Ryze mushroom coffee is generally safe for most healthy adults. It contains about 48 mg of caffeine per serving, roughly half the amount in a standard cup of coffee, and its mushroom ingredients have long histories of use in food and traditional medicine. That said, several specific groups face real risks, and the product sits in a regulatory gray area that’s worth understanding before you make it part of your routine.
What’s Actually in Ryze
Ryze blends organic arabica coffee with six functional mushroom extracts: cordyceps, lion’s mane, reishi, shiitake, turkey tail, and king trumpet. The formula also includes MCT oil and coconut milk. The mushrooms are processed using hot water extraction or dual extraction (hot water followed by alcohol) to pull out compounds like beta-glucans and triterpenes, which are the active ingredients behind the product’s marketed health benefits.
The caffeine content lands around 48 mg per cup, compared to 90 to 110 mg in a typical 8-ounce cup of drip coffee. If you’re sensitive to caffeine or trying to cut back, that’s a meaningful difference. But it’s not caffeine-free, so it still counts toward your daily intake.
Digestive Side Effects
The most common complaints are bloating, nausea, and diarrhea, particularly if you drink a lot of it or have a sensitive stomach. Lion’s mane and reishi extracts have both been specifically linked to stomach upset. Constipation is less common but possible, especially with mushroom varieties that are higher in fiber.
If you have irritable bowel syndrome, you’re more likely to experience these issues. Starting with a half serving and building up over a few days can help you gauge your tolerance before committing to a full cup.
Blood Thinning and Surgery Risks
This is where the safety picture gets more serious. Several of Ryze’s mushroom ingredients, including reishi, cordyceps, and lion’s mane, have documented antiplatelet and anticoagulant activity. In plain terms, they can slow blood clotting.
A case report published in MDPI documented postoperative bleeding following colon surgery in a patient who had been drinking mushroom coffee. The medical team traced the problem to the mushroom blend’s effects on clotting. Reishi in particular has been shown to inhibit platelet aggregation and prolong clotting times. Cordyceps works through a different mechanism, affecting the body’s clot-dissolving pathways, but the end result is similar.
If you take blood thinners like warfarin or direct oral anticoagulants, or if you’re on antiplatelet medications, Ryze could amplify their effects and increase your bleeding risk. The same concern applies to anyone facing surgery. The current recommendation is to stop mushroom coffee and similar supplements at least one to two weeks before any scheduled procedure, just as you would with prescribed blood thinners.
Blood Sugar Interactions
Cordyceps can lower blood sugar levels. For most people, this isn’t a problem. But if you take insulin or other diabetes medications, adding cordyceps into the mix could push your blood sugar too low. Memorial Sloan Kettering Cancer Center flags this as a potential drug interaction, noting that cordyceps may have additive effects when combined with blood sugar-lowering medications. The clinical significance hasn’t been fully established, but the biological mechanism is real enough to warrant caution.
Immune Stimulation and Autoimmune Conditions
Functional mushrooms are often marketed as “immune-boosting,” which sounds universally positive but isn’t. If you have an autoimmune condition like lupus, rheumatoid arthritis, or multiple sclerosis, stimulating an already overactive immune system can make things worse. Some mushroom species also contain natural compounds that inhibit a specific enzyme (the same enzyme targeted by statin drugs), which has been linked to triggering a rare autoimmune muscle disease called necrotizing myopathy.
This doesn’t mean every person with an autoimmune condition will have a reaction to Ryze. But the theoretical risk is grounded enough that it’s worth discussing with your doctor before adding it to your diet.
Safety During Pregnancy and Breastfeeding
There simply isn’t enough clinical data to confirm that Ryze’s mushroom extracts are safe during pregnancy and breastfeeding. The North American Mycological Association puts it clearly: compounds with unknown safety profiles are generally not recommended during pregnancy, especially in the first trimester when fetal development is most vulnerable.
Some of Ryze’s mushrooms, like lion’s mane and shiitake, are also common culinary mushrooms and are considered safe when eaten as food. But the distinction matters. A concentrated extract delivers far more of these active compounds than a serving of mushrooms in a stir-fry. Reishi carries the additional concern of mild antiplatelet activity, which could affect bleeding during delivery. If consumed before birth, it should be discontinued at least one week before a vaginal delivery or C-section.
Regulation and Quality Control
Ryze is sold as a food product, not a medication, which means it doesn’t go through FDA approval. The FDA has specifically noted that mushroom extracts like cordyceps and reishi are not generally recognized as safe and effective when marketed with health claims. This doesn’t mean the ingredients are dangerous, but it does mean no federal agency has independently verified the product’s safety, purity, or potency.
On the purity front, there’s a relevant data point. In 2024, Ryze settled a Proposition 65 case in California after testing found lead in its Mushroom Overnight Oats product. The settlement required Ryze to ensure that its oats products didn’t expose consumers to more than 0.5 micrograms of lead per serving, or else carry a health warning. This settlement applied to the oats, not the coffee, but it does raise questions about the company’s quality control across its product line. No public data is available on heavy metal testing results for the mushroom coffee specifically.
Who Can Safely Drink Ryze
For a healthy adult who isn’t pregnant, doesn’t take blood thinners or diabetes medication, and doesn’t have an autoimmune condition, Ryze is a reasonable low-caffeine coffee alternative. The mushroom extracts have centuries of use in traditional medicine and food, and the caffeine dose is modest enough to suit people who find regular coffee too stimulating.
The groups who should be cautious or avoid it entirely:
- People on blood thinners or antiplatelet drugs, due to the clotting effects of reishi, cordyceps, and lion’s mane
- Anyone scheduled for surgery, who should stop drinking it at least one to two weeks beforehand
- People taking insulin or diabetes medications, because cordyceps can lower blood sugar further
- Those with autoimmune conditions, since immune-stimulating mushrooms could worsen symptoms
- Pregnant or breastfeeding women, given the lack of safety data on concentrated mushroom extracts during pregnancy
- People with IBS or sensitive digestion, who are more likely to experience bloating, nausea, or diarrhea
If none of those apply to you, the biggest practical risk is digestive discomfort, which typically resolves by reducing your serving size or giving your body a few days to adjust.