Lion’s mane side effects are best answered from the human studies, and the clearest safety signal in them is a blood-pressure rise that a 2023 study tied to guayusa extract, a different ingredient in the same trial. Your practical checks are the label, its directions, and a pharmacist’s review if you take medicine. A 2015 review in the Journal of Agricultural and Food Chemistry, indexed by the U.S. National Library of Medicine, describes lion’s mane as widely consumed in Asian countries, and you will find it in several product formats.
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| Clearest safety signal | A blood-pressure rise in the 2023 guayusa and lion’s mane crossover study, which the abstract ties to the guayusa extract arm. |
| Study doses | 1.8 g in a 2023 pilot of 41 healthy adults aged 18 to 45; a single 1 g dose of Nordic-grown lion’s mane in a 2023 crossover study. |
| Who to check with first | A pharmacist, if you take medicine or have a known mushroom allergy. |
| Pilly Adaptogen Vitality Gummies | Pilly Labs sells this gummy; check the package label for which mushrooms it contains and how much of each. |
| Price | Prices and bundles change, so check today’s price with the company at checkout. |
What are the side effects of lion’s mane?
The clearest safety signal in the human research is a rise in blood pressure. The 2023 guayusa and lion’s mane crossover, published in the journal Nutrients and indexed by the U.S. National Library of Medicine, compared single doses of guayusa extract, 1 g of Nordic-grown lion’s mane, and placebo, and its abstract names the blood-pressure change only for the guayusa arm.
| Study | Dose and people | What the abstract reports |
|---|---|---|
| 2023 pilot trial in Nutrients | 1.8 g; 41 healthy adults aged 18 to 45; one dose, plus 28 days of supplementation | Faster Stroop task at 60 minutes (p = 0.005); a trend toward lower self-reported stress after 28 days (p = 0.051) |
| 2023 guayusa and lion’s mane crossover | Single doses of 1 g Nordic-grown lion’s mane, 650 mg guayusa extract, or placebo | Lion’s mane: better working memory and reaction-time measures at two hours. Guayusa extract: blood pressure rose from baseline. |
The 2025 narrative review on lion’s mane says clinical validation remains limited and calls for larger clinical trials and standardized extraction methods, so treat this safety picture as a starting point.
Why do some people feel off after taking lion’s mane?
Start with the timing. Note the product name, the form (capsule, powder, gummy, coffee or drink), the amount on the label, when you took it, what else you took that day, and when the feeling began. Coffees and blends can contain caffeine or other ingredients, so the full label matters more than the name on the front.
If you have trouble breathing or swelling of the face or throat after any new supplement, get emergency help right away. If you have a known mushroom allergy or take medicine, ask a pharmacist before you start.
Can lion’s mane be taken with medicines?
The answer depends on your prescriptions and the full product formula. The lion’s mane drug interactions guide covers four medication classes to check, and the lion’s mane medication list guide explains what to bring to a pharmacist. Bring the actual bottle or a photo of the label, because the pharmacist needs every ingredient, not only the words lion’s mane.
Can you take lion’s mane and ashwagandha together?
Both show up in focus and stress products, but they are separate ingredients with separate labels. The lion’s mane vs ashwagandha comparison sets the label differences side by side. Do not start two new products at once if you want a clear answer about a new symptom.
Does lion’s mane help memory, focus or sleep?
Lion’s mane is marketed for focus and brain support. The human results so far are about speed, attention and stress rather than a memory guarantee. In the 2023 pilot, 41 healthy adults aged 18 to 45 took 1.8 g. After one dose, the lion’s mane group finished a Stroop task faster at 60 minutes, and after 28 days the group showed a trend toward lower self-reported stress. The authors write that these findings tentatively suggest improved speed of performance and reduced subjective stress.
In the 2023 crossover, a single 1 g dose improved some working-memory and reaction-time measures two hours later. A 2015 review lists anxiety, cognitive function and depression among the properties reported for the mushroom. Both trials measured thinking speed, attention, memory-type tasks and stress, rather than sleep. For the wider picture of the trials, see the lion’s mane supplement 2026 trial summary, and for the wider focus and anxiety picture, see the brain health, focus and anxiety guide.
How quickly does lion’s mane work?
In these studies, the measured changes appeared 60 minutes after one dose in the pilot, at one and two hours in the crossover, and after 28 days for the stress trend. Those are the timings the studies used. If you start a product, write down the start date so you can see what changes over the first month.
How much lion’s mane is a study dose?
The 2023 pilot used 1.8 g and the crossover used 1 g. Those are study amounts, and the label’s directions are the starting point for any product. Check the label for lion’s mane’s own amount. When a blend lists one combined total, that total is the only number to compare, so check whether each mushroom is listed separately.
How do lion’s mane products differ?
Products can look alike in an ad while being very different on the label. Some provide lion’s mane alone. Others put it in a coffee, drink, powder, gummy, or multi-mushroom blend, and that changes what else you take with it.
| Format | What to compare | Why it matters |
|---|---|---|
| Single-ingredient capsule or powder | Source material, amount per serving, directions | It is easier to compare the lion’s mane amount with a study amount. |
| Multi-mushroom blend | Whether each mushroom amount is listed | A combined total hides how much lion’s mane is inside. |
| Coffee or drink | Caffeine and all added ingredients | Caffeine or another ingredient may shape how you feel. |
| Gummy | Serving size, active ingredients, sugar and flavoring | Convenience does not answer the dose question by itself. |
Pilly Adaptogen Vitality Gummies
Pilly Labs sells Adaptogen Vitality Gummies. Read the package label’s ingredient list before you order to see which mushrooms are in it and how much of each, and compare it with the medicines and supplements you already use.
| Item | Product page |
|---|---|
| Product | Adaptogen Vitality Gummies, Pilly Labs |
| Product Page | Product Page |
What does it cost, and where do you buy it?
Prices and bundles change, so check today’s price directly on the product page or at checkout. Before you buy, match the label’s ingredient list to the exact product in your cart.
Before you order
- Ask the seller for the label with each mushroom’s amount per serving, and check whether lion’s mane is listed alone or inside a blend.
- Confirm which mushrooms the gummy contains and how much of each, using the package label.
- Compare the label with the medicines and supplements you already use.
- Keep the package and note the product, dose and timing if a symptom starts.
By HealthDataConsortium.org Research Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.
