Cataplex® E for Dogs by Standard Process: Benefits, Uses, Safety

As a holistic veterinarian, I am often asked about supplements that can support whole body health in dogs, especially when pet parents want something food-based and thoughtfully formulated. One supplement that comes up often is Cataplex® E by Standard Process.

Although Cataplex E was originally developed for humans, it is commonly used in veterinary practice to support dogs who may benefit from extra antioxidant, reproductive, vascular, or thyroid support. When used appropriately, it can be a valuable addition to a dog’s wellness plan.

Let’s walk through what Cataplex E is, how it works, and when I consider it helpful for dogs.

What Is Cataplex® E by Standard Process?

Cataplex E is a whole food-based vitamin E supplement that also provides selenium and a proprietary blend of organ and plant ingredients. It is designed to support cellular health, antioxidant balance, and healthy thyroid function.

This supplement focuses on nourishment at the cellular level, meaning it supports how cells communicate, repair, and protect themselves from oxidative stress.

A Quick Note on Standard Process

Standard Process has been producing whole food supplements since 1929. Their approach centers on food-based nutrients, controlled manufacturing, and consistent quality testing. Cataplex E has been part of their lineup for decades and is widely used in both human and veterinary wellness settings.

Key Benefits of Cataplex® E for Dogs

Cataplex E supports multiple body systems at once. That versatility is one of the reasons I reach for it in practice.

Antioxidant Support

Vitamin E and selenium are both antioxidants. Antioxidants help neutralize free radicals, which are unstable molecules that can damage cells over time. Supporting antioxidant balance is especially helpful for aging dogs, active dogs, or dogs under physical stress.

Thyroid and Metabolic Support

Selenium is required for the production and regulation of thyroid hormones. These hormones influence metabolism, energy levels, and overall cellular function. Adequate selenium supports healthy thyroid activity and normal metabolic processes.

Reproductive Health Support

Cataplex E contains bovine orchic extract, which has traditionally been used to support reproductive tissue health. This is most often considered for intact dogs during breeding years, but it can also support overall endocrine balance.

Vascular and Circulatory Health

Vitamin E supports healthy blood vessels and circulation by protecting the delicate lining of blood vessels from oxidative damage. This can be helpful for dogs where cardiovascular support is part of the wellness picture.

Immune System Support

Several ingredients in the proprietary blend, including spleen extracts and whole food nutrients, support immune system function. These ingredients provide building blocks that help the immune system respond appropriately.

How Cataplex® E Works in the Body

Cataplex E works by supplying nutrients that the body already uses every day.

• Vitamin E protects cell membranes and supports immune signaling.

• Selenium supports thyroid hormone metabolism and DNA synthesis.

• Whole food organ extracts provide naturally occurring cofactors that support cellular communication.

• Antioxidant support helps reduce oxidative stress, which can affect many body systems at once.

Rather than targeting a single symptom, Cataplex E supports underlying biological processes.

Ingredients in Cataplex® E by Standard Process

Each serving size of two tablets provides:

• Vitamin E: 3.3 mg

• Selenium: 11 mcg

Proprietary Blend (510 mg)

This blend includes:

• Bovine orchic extract

• Inositol

• Organic pea vine juice powder

• Ribonucleic acid (RNA)

• Bovine adrenal

• Organic beet root

• Organic oat flour

• Bovine spleen

• Ovine spleen

• Bovine liver

• Manganese lactate

• Ascorbic acid

Other Ingredients

Honey, selenium yeast, d-alpha tocopherol (vitamin E from sunflower), modified tapioca starch, acacia gum, and calcium stearate.

Each ingredient serves a purpose, whether supporting metabolism, immune health, antioxidant balance, or cellular repair.

When I Consider Cataplex® E for Dogs

Cataplex E may be appropriate for dogs who need support in areas such as:

• Antioxidant and cellular health

• Thyroid and metabolic balance

• Reproductive system support

• Immune system resilience

• Skin and coat health related to oxidative stress

As with any supplement, context matters. I always look at the whole dog, including diet, age, health history, and current medications.

Dosage and Administration for Dogs

Standard Process suggests:

Two tablets per meal, or as directed.

In veterinary use, I typically adjust dosing based on size:

Tablets can be given whole or crushed and mixed into food.