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UMZU Redwood Reviews

Can this all-natural supplement boost your sexual stamina? We look into the science and put Redwood to the test so you can decide.

Last Updated: Mar 23, 2022
UMZU Redwood

Erectile dysfunction may be a touchy subject for some, but it’s a widespread issue, affecting the lives of approximately 40% of men by the age of 40. And as we age, the prevalence of comorbidities increases, including problems like high blood pressure, reduced circulation, and decreased stamina.

Aside from eating a nutritious diet and maintaining a healthy workout regimen, is there anything we can do to naturally treat erectile dysfunction and the cardiovascular issues that often accompany it?

We recently tested Redwood, a circulatory support supplement aimed at men from the well-known company UMZU. Redwood promotes better blood flow and boosts immunity, increasing stamina in the gym and the bedroom. Read our full review below to see the pros, cons, and details of Redwood so you can determine if it’s right for you.

Review Summary


  • Improves circulation and lowers blood pressure
  • May enhance sexual and athletic stamina
  • All-natural ingredients with no additives or fillers
  • Promotes stronger immunity
  • 60-day money-back guarantee
  • Free shipping on orders over $99
  • Subscribe & Save program takes 15% off all orders


  • Not vegan-friendly (contains dairy products)
  • Geared generally towards men
  • May interact with cardiovascular and other medications

Bottom line

We recommend UMZU Redwood for men seeking all-natural therapies to achieve better circulation, stamina, and improved sexual performance. This product also brought increased energy and mental focus in our testing team. UMZU is a widely-trusted company providing effective, transparent, and holistic treatments for men and women across all health and fitness categories — from hormonal balance to weight loss.

Our Top Picks

UMZU Redwood

Redwood fits the bill for men looking for an all-natural supplement that can improve circulation, stamina, and sexual performance.

Its wide range of benefits stem from a blend of high quality ingredients. Receive free shipping on orders over $99, and enjoy a 60-day money-back guarantee on all purchases. Just note: it isn’t vegan-friendly.

Reviewed by Innerbody Research
Low T Bundle
Reviewed by Innerbody Research
Male Vitality Optimization Bundle
Reviewed by Innerbody Research

Why you should trust us

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions involving staying healthy and living healthier lifestyles.

We extensively test each health service or product we review. We try our best to give you, our readers, an unbiased exploration of at-home health options, free of marketing jargon or gimmicks. We evaluate products and services based on their adherence to quality, the latest medical evidence and health standards, and a simple question: would we buy the product or service ourselves if it weren’t part of our job, and would we recommend it to family and friends?

Additionally, like all health-related content on this website, this review was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

What is Redwood?

Redwood is an all-natural, male-geared supplement that promotes cardiovascular health and may improve sexual and athletic function. Some of its main benefits include:

  • Increased blood flow and circulation
  • Decreased blood pressure
  • Improved sexual and athletic stamina
  • Strengthened immune system
  • Reduced varicose veins
  • Improved mood

Redwood’s manufacturer, UMZU, arose in 2015, producing all-natural supplements for men and women. Founder Christopher Walker developed this holistic wellness company after achieving personal success in treating the hormonal impacts of a pituitary tumor with natural botanicals.

UMZU has since continued to grow in popularity and reputation, offering an array of all-natural, scientifically-backed supplements for:

  • Hormonal balance
  • Gut health
  • Energy
  • Weight loss
  • Bone health
  • Improved mood
  • Heightened focus

UMZU is a reputable and trusted brand, most notably for its transparency in a market that often hides behind proprietary blends to avoid listing ingredient amounts or fillers. With few exceptions, UMZU provides detailed information about all components in its products and backs up their usage through scientific findings and studies.

Does UMZU Redwood work?

UMZU Redwood contains several potent ingredients that are fully backed by science. We found the product safe and effective in promoting healthy overall circulation, boosted energy, and better stamina. Our testing team felt more energized and had more intensive workouts while using the product, and yes, we also found it effective in improving our experiences in the bedroom.

UMZU advises taking the supplement for 60 days to achieve its benefits fully, but we experienced noticeable effects in just about a month. While individual results varied among our male testers, the consensus was that Redwood is an effective supplement with few adverse side effects.

How Redwood works

UMZU describes Redwood as a natural nitric oxide booster, but what does that mean? Nitric oxide is a free radical and a cardiovascular signaling molecule in humans. When your body produces more nitric oxide, your blood vessels dilate, increasing blood flow and reducing blood pressure.

You’ll often find nitric oxide boosters in male health supplements for athletes and bodybuilders and herbal and prescription remedies for erectile dysfunction (including Viagra). The principle behind them is that increased circulation assists in healthier blood flow to the sexual organs and provides greater stamina and performance in the bedroom and the gym.

Redwood does not contain actual nitric oxide but stimulates the body to produce it through a combination of natural extracts. Below, we’ll look at the science behind these components and how they work together to improve circulation and stamina.

Vitamin C (1,000 mg)

It’s no big news that vitamin C boosts immunity, but this antioxidant has also proven to increase nitric oxide synthase activity and vascular function in animal and human trials. Long-term vitamin C treatment can help:

  • Lower blood pressure
  • Reduce oxidative stress
  • Boost nitric oxide production

Each Redwood serving (three capsules) contains 1,111% of the DV for vitamin C. When you take this supplement as recommended, you’ll be receiving over 2,000% of the daily value for vitamin C. Excess vitamin C is not dangerous, and whatever the body does not absorb passes through the urine.

Garlic root powder (300 mg)

Garlic contains sulfur and the bioactive compound quercetin, which researchers study for its antioxidant effects in preventing and treating some cancers, lung and cardiovascular diseases, and osteoporosis. Quercetin has shown to:

  • Promote bone healing and health
  • Prevent heart damage by enhancing the antioxidant defense system
  • Regulate signaling pathways to reduce oxidative stress
  • Treat and prevent liver injury by removing free radicals in the body

Further clinical studies have demonstrated that garlic is an effective treatment for high blood pressure in hypertensive patients. Scientists continue to study its potential to treat erectile dysfunction in aging males.

Horse chestnut seed extract (250 mg)

Horse chestnut seed extract is derived from the nuts of a southeastern European tree, long used for treating circulation issues in the legs. Studies have demonstrated potential for the use of horse chestnut in treating:

  • Chronic venous insufficiency (CVI) in the legs
  • Irritable bowel syndrome
  • Male infertility and erectile dysfunction

Horse chestnut contains a coumarin glucoside called esculin, which promotes circulation and can reduce inflammation and swelling in the legs and improve elasticity in the veins. Horse chestnut seed extract may cause some side effects, including gastrointestinal discomfort, nausea, headaches, and increased risk of bleeding.

Casein hydrolysate (125 mg)

Casein hydrolysate is a source of amino acids derived from cow’s milk. It demonstrates antihypertensive activity, minimizes blood pressure, and boosts metabolism. However, conclusions in clinical trials have been conflicting, and more testing is needed to confirm its potential across regional populations.

Pine bark extract (100 mg)

Pine bark extract contains bioflavonoids that enhance vasodilation by stimulating increased nitric oxide production in the body. Meta-analysis of clinical trials shows that the bioflavonoids in pine tree bark extract have antioxidant and anti-inflammatory effects and demonstrate several benefits, including:

  • Reducing free radicals in the body
  • Increasing circulation and blood flow
  • Lowering the levels of biomarkers of cardiovascular disease
  • Reducing blood pressure and cholesterol levels

L-leucine (75 mg)

L-leucine is an essential amino acid found in protein-rich foods like meat, fish, eggs, and milk. It has several potential benefits, including:

  • Helping build muscle mass
  • Improving athletic performance
  • Aiding recovery from exercise
  • Assisting in healing in skin and bones
  • Increasing production of human growth hormone (HGH)
  • Controlling blood sugar

How to take Redwood

A 30-day supply of Redwood contains 180 capsules, meaning you’ll take six daily. UMZU recommends taking three pills twice daily with meals.

Is UMZU Redwood safe?

Redwood’s ingredients are safe for average adults without severe medical conditions. However, we advise consulting with your physician before beginning this or any new supplement, especially if you are currently taking any medications or have a history of food or drug allergies.

Several of the ingredients in Redwood promote better blood flow and reduced blood pressure. These ingredients may interfere with cardiovascular medications and could increase the risk of bleeding.

Additionally, Redwood contains milk products, which may be an issue for allergy sufferers.

UMZU Redwood is not advised for pregnant or nursing women and is inappropriate for children.


Like all supplements from UMZU, you can buy Redwood as a single purchase or sign up for a subscription membership which takes 15% off all orders. UMZU also includes Redwood as part of two health bundles:

  • The Male Vitality Optimization Bundle combines Redwood with Testro-X and Floracil50, supplying men with nutrients and compounds to boost testosterone production and support sexual stamina, better circulation, and improved digestion.
  • The Low T Bundle includes Redwood, Testro-X, Betaine HCl, and Cortigon. This combination of supplements provides men with micronutrients that boost testosterone, energy, strength, and stamina while improving circulation, digestion, focus, mood, and immunity.

In the chart below, you’ll see the individual, subscription, and bundle prices for Redwood side by side to see what option may be best for you. UMZU provides free shipping on any order over $99.

  One-time purchase Subscription purchase
Redwood $39.95 $33.96
Male Vitality Optimization Bundle $139.85 $118.87
Low T Bundle $154.80 $131.58

Is UMZU Redwood a good value?

Redwood is a moderately priced supplement that stands above the competition in the quality and quantity of its scientifically-backed ingredients. Moreover, it costs about $10 less than Approved Science’s Nitric Oxide MD or SNAP’s Nitric Oxide Organic Beets. Given UMZU’s transparency with its ingredients and labeling, we found it to be an excellent value.

HSA, FSA, and health insurance

UMZU does not accept payments from HSAs, FSAs, or health insurance.

Privacy considerations

UMZU uses cookies and other tracking technologies to collect user information on its website. It may use this information for targeted marketing and ease of use on the site or share your personal information with its affiliates or partners to provide services or advertising. UMZU does not store or collect your payment details, which are submitted directly to third-party payment processors.

How we evaluate health products and services

At Innerbody Research, we customize our evaluation criteria depending on the type and nature of the health-related service or product. But in general, for health products and services, we have five broad areas that we explore in our evaluations, including:

Quality: How well does the company deliver its core service(s) to the customer? For testing services, does the company adhere to the latest and most advanced testing technologies and achieve a very high degree of accuracy? For non-testing telemedical or teletherapy services, is the quality of the service high enough that we would recommend it to loved ones without hesitation? If not, why not? For health products, does the product or device meet a high level of safety? Is it manufactured with high-quality standards? Has it – or have its ingredients – been subjected to studies that confirm effectiveness?

User-friendly: How intuitive and convenient is the service or product? Does the device, program, app, or website achieve a good degree of user-friendliness for its customers?

Value: Are you getting your money’s worth? Are there any hidden costs or charges? Does the company offer discounts?

Privacy: If health data is stored, will your data be stored securely? Are payments secure? Does a company market your information?

Customer support: Particularly in situations where ‘one size fits all’ doesn’t make sense, how well does the company help make the service or product ideal for you or address your individual needs?

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