8 Best Weight Gain Supplements For Cats 2026, According to Experts

Last Updated on May 21, 2026

Cats, like humans, sometimes need a little help gaining weight. Weight gain supplements can be a convenient solution.

Whether your cat is recovering from an illness or is naturally lean, adding weight can be important for their health. Many cats face challenges in maintaining a healthy weight, especially as they age. High-calorie supplements are specifically designed to support your feline friend’s weight gain journey.

These products offer a blend of essential vitamins, minerals, and energy boosters. Brands like Under the Weather, PetAg, and Solid Gold provide options tailored for different needs. From gels to powders, these supplements cater to various preferences, ensuring your cat gets the nutrition they need. Choosing the right supplement can make a noticeable difference in your cat’s overall well-being.

Under The Weather Ready Cal Powder For Cats

The Under the Weather Ready Cal Powder for Cats is an ideal choice for cat owners who are looking to boost their pet’s energy levels, stimulate appetite, and support healthy weight gain. This product is particularly beneficial for cats recovering from illness, surgery, or those who are naturally underweight. It is also suitable for senior cats who may require additional nutritional support to maintain their vitality and well-being.

Pros:

• High-calorie formula aids in weight gain.
• Appetite stimulant to encourage eating.
• Veterinarian-approved for safe use.
• Chicken flavor that appeals to cats.
• Contains essential vitamins and minerals.

Cons:

• May not be suitable for cats with specific dietary restrictions.
• Powder form may require mixing with food or water.

The Ready Cal Powder is designed with the health and vitality of cats in mind, offering a high-calorie content that supports healthy weight gain. This is particularly beneficial for cats that are underweight due to health issues or aging, as it helps them regain their energy and overall health. The inclusion of vitamins and minerals ensures that your cat receives the necessary nutrients to support their immune system and maintain a balanced diet.

Additionally, the appetite stimulant properties of the supplement encourage cats to eat more, which is crucial for those who have lost their appetite due to illness or stress. The chicken flavor is particularly appealing to cats, making it easier for pet owners to integrate this supplement into their pet’s diet. The product’s veterinarian-approved status provides an added layer of confidence for cat owners, ensuring that they are giving their pets a safe and effective supplement.

To buy this product, click here.

Under The Weather Pet | Ready Cal For Cats

The Under The Weather Pet Ready Cal for Cats 100cc is ideal for cat owners who are concerned about their pet’s weight and overall nutritional intake. Whether your cat is recovering from illness or simply needs a high-calorie supplement to maintain a healthy weight, this product offers a solution. It’s particularly beneficial for cats with low appetite or those requiring a weight gain boost.

Pros:

• High Calorie content for effective weight gain
• Contains 10 Vitamins and 7 Minerals for optimal health
• Includes Omega Fatty Acids for a healthy coat and skin
• Easy-to-administer 100cc tube

Cons:

• Some cats may not like the taste
• Requires monitoring to avoid overfeeding

The Ready Cal for Cats 100cc offers a comprehensive blend of essential nutrients that support your cat’s overall health. The inclusion of 10 vitamins and 7 minerals ensures that your feline friend receives a balanced supplement aiding in energy and vitality. This makes it an excellent choice for cats recovering from illness or undergoing nutritional deficiencies.

Additionally, the presence of Omega Fatty Acids in the supplement enhances your cat’s coat and skin health, promoting a lustrous appearance. The formulation is convenient and easy to administer, making it stress-free for both pet and owner. By choosing this high-calorie supplement, you can ensure your cat remains energetic and maintains an optimal weight.

To buy this product, click here.

Petag High Calorie Gel Supplement For Cats

The PetAg High Calorie Gel Supplement for Cats is perfect for cat owners who are looking to provide their feline friends with extra calories in a convenient and easy-to-digest form. This product is ideal for cats that are 8 weeks and older, particularly those who require additional nutritional support due to weight management issues, recovery from illness, or higher energy needs. If your cat needs a calorie boost to maintain a healthy weight or recover from a challenging health phase, this supplement could be an excellent addition to their diet.

Pros:

• High calorie content for cats needing additional energy.
• Chicken flavor appeals to cats, encouraging consumption.
• Easy to digest formula suitable for cats with sensitive stomachs.
• Compact packaging allows for easy storage and portability.

Cons:

• Some cats may not like the gel texture.
• It may not be suitable for cats with specific dietary restrictions.

The PetAg High Calorie Gel Supplement offers a simple and effective way to ensure your cat gets the extra calories they need. The chicken flavor is particularly enticing, making it easier to administer to even the pickiest of eaters. This supplement is designed to be easy to digest, which is a significant advantage for cats with sensitive stomachs or those recovering from an illness. By providing essential nutrients in a palatable form, it helps support overall health and vitality.

The product’s dimensions and lightweight packaging make it convenient for storage and travel, ensuring you can easily provide your cat with the necessary nutrition wherever you go. However, while the gel texture is generally easy to administer, some cats might be hesitant to try it at first. It’s important to introduce the supplement gradually and monitor your cat’s reaction. Additionally, while the supplement is beneficial for most cats needing a calorie boost, it’s always wise to consult with a veterinarian if your cat has specific dietary needs or health concerns.

To buy this product, click here.

Bovine Colostrum Nutritional Gel For Dog & Cat

The Bovine Colostrum Nutritional Gel is an ideal choice for pet owners who are looking to enhance their pets’ appetite, boost their immune system, and support healthy weight gain in senior dogs and cats. This product is especially beneficial for pets recovering from illness, those with a poor appetite, or older pets needing extra nutritional support.

Pros:

• High calorie supplement aids in weight gain for pets.
• Supports immune system for both dogs and cats.
• Enhances appetite, making it suitable for picky eaters.
• Easy to administer gel form.

Cons:

• May not be suitable for pets with specific dietary restrictions.
• Some pets may dislike the taste.
• Cost may be higher compared to other supplements.

The Bovine Colostrum Nutritional Gel by YoYoBay offers a unique blend of nutrients designed to support pets’ overall health. The high calorie content is particularly beneficial for pets needing to gain weight, such as those recovering from illness or older pets with diminished appetites. The immune support provided by the gel is a crucial feature, helping to bolster the natural defenses of both dogs and cats, ensuring they remain healthy and active.

Additionally, the easy-to-administer gel form makes it simple for pet owners to provide the necessary nutrition without the hassle of pills or powders. This product is manufactured by YoYoBay, a trusted name in pet nutrition, ensuring quality and effectiveness. For pet owners seeking a reliable way to improve their pets’ nutritional intake, the Bovine Colostrum Nutritional Gel is a worthy consideration.

To buy this product, click here.

2-pack Nutri-cal For Cats High Calorie Dietary Supplement

The 2-Pack Nutri-Cal for Cats High Calorie Dietary Supplement is ideal for pet owners who have cats with special dietary needs or those who require additional caloric intake due to illness, recovery, or high activity levels. This product is particularly beneficial for senior cats, underweight cats, or picky eaters who may not be getting enough nutrients from their regular diet.

Pros:

• High calorie content helps in gaining and maintaining weight.
• Palatable taste that appeals to even the pickiest eaters.
• Easy to administer in a convenient 4.25-ounce tube.
• Trusted brand with a strong reputation in pet care.

Cons:

• Some cats may not like the texture of the supplement.
• Higher caloric content may not be suitable for overweight cats.

The Nutri-Cal for Cats comes in a compact, easy-to-use tube, making it simple to serve directly or mix with your cat’s food. This ensures your feline friend gets the essential nutrients they need without any hassle. The supplement is enriched with vitamins and minerals that promote overall health and vitality, making it an excellent choice for cats that require a nutritional boost.

One of the standout features is the palatable flavor, which is designed to attract cats and make feeding an enjoyable experience. For pet owners concerned about nutritional deficiencies, this supplement provides peace of mind by ensuring their cat receives a balanced intake of nutrients. Additionally, being manufactured by Tomlyn, a brand known for its commitment to quality, adds an extra layer of trust for consumers.

To buy this product, click here.

Solid Gold Nutrientboost™ Cat Food Toppers For Cats

The Solid Gold NutrientBoost™ Cat Food Toppers are perfect for indoor cat owners who prioritize their pet’s health and well-being. If you’re looking for a way to enhance your cat’s diet with extra protein and essential nutrients, this product is ideal for you. Suitable for cats of all ages, it’s an excellent choice for those who want to support their pet’s gut health and immune system.

Pros:

• High Protein content for muscle growth and maintenance.
• Enriched with vitamins, minerals, and amino acids.
• Supports gut health and immune system.
• Suitable for cats of all ages.
• Crunchy texture enhances palatability.

Cons:

• Might not be suitable for cats with specific dietary restrictions.
• Price may be higher compared to standard cat food toppers.

The Solid Gold NutrientBoost™ Cat Food Toppers offer a unique blend of high protein and nutritional supplements that cater to the needs of indoor cats. The crunchy texture not only makes it an enjoyable treat but also aids in dental health. Packed with essential vitamins, minerals, and amino acids, this product ensures that your cat receives a balanced diet that supports their overall health.

One of the standout features of this product is its ability to support gut health and boost the immune system. The inclusion of key nutrients helps in maintaining a healthy digestive tract, which is crucial for nutrient absorption and overall vitality. Additionally, this meal topper is designed to cater to cats of all ages, making it a versatile choice for households with multiple cats.

To buy this product, click here.

Tiki Cat Silver Comfort Mousse

The Tiki Cat Silver Comfort Mousse is an ideal choice for cat owners who have senior cats aged 11 and above. This product is specially formulated to meet the unique dietary needs of older cats, providing them with the essential nutrients to maintain their health and vitality. Pet parents looking for a high-calorie, palatable wet food option to support their aging cats’ nutritional requirements will find this product particularly beneficial.

Pros:

• High-calorie content supports the energy needs of senior cats.
• Palatable mousse texture is easy for older cats to consume.
• Formulated with chicken and chicken liver for a taste cats love.
• Provides essential nutrients tailored for cats aged 11+.

Cons:

• May not be suitable for cats with specific dietary restrictions.
• Higher price point compared to some other senior cat foods.

The Tiki Cat Silver Comfort Mousse is crafted with senior cats in mind, featuring a high-calorie formula that helps maintain their energy levels. The inclusion of chicken and chicken liver not only makes it appetizing but also provides a rich source of protein and essential nutrients. This is especially beneficial for older cats who may have diminished appetites or require extra encouragement to eat. The mousse texture is gentle on aging teeth and gums, ensuring that even those with dental issues can enjoy their meals comfortably.

Beyond its nutritional composition, the Tiki Cat Silver Comfort Mousse is designed to provide a complete and balanced diet for senior cats. The convenient 5.6 oz pouches offer easy portion control, ensuring that your pet receives the right amount of food without any wastage. Additionally, the product is free from artificial colors and preservatives, making it a healthier choice for your beloved pet. With its thoughtful formulation, this product aims to enhance the quality of life for senior cats, allowing them to enjoy their golden years with vitality and contentment.

To buy this product, click here.

Petag High Calorie Gel Supplement For Cats

The PetAg High Calorie Gel Supplement for Cats is ideal for cat owners who are looking to provide their feline companions with an extra boost of calories. This product is perfect for cats 8 weeks and older that may need additional energy, whether due to underweight issues, recovery from illness, or simply being picky eaters. It is also suitable for owners who prefer an easy-to-administer supplement that is easy to digest.

Pros:

• High calorie content for boosting energy levels.
• Easy to digest, making it gentle on your cat’s stomach.
• Chicken flavor that appeals to most cats.
• Convenient pack of 2, ensuring you have a steady supply.

Cons:

• Might not be suitable for cats with specific dietary restrictions.
• Small tube size might require frequent purchases for long-term use.

The PetAg High Calorie Gel Supplement stands out with its high calorie content, specifically designed to help underweight cats gain the necessary energy and weight. Its chicken flavor is highly palatable, making it easier for pet owners to encourage their cats to consume it without resistance. The supplement’s easy-to-digest formulation ensures that even cats with sensitive stomachs can benefit from this product without discomfort.

Additionally, this supplement comes in a convenient pack of two, ensuring that you always have a backup ready. Each tube is lightweight, making it easy to handle and store. However, cat owners should be aware of their pet’s dietary needs and consult with a veterinarian if there are any concerns regarding specific health conditions. Overall, the PetAg High Calorie Gel Supplement provides a practical and effective solution for enhancing your cat’s diet with additional calories.

To buy this product, click here.

Frequently Asked Questions

What Are The Benefits Of Weight Gain Supplements For Cats?

Weight gain supplements can help cats maintain a healthy weight, support appetite, and improve energy levels. They often contain essential vitamins, minerals, and amino acids that promote overall health. These supplements are particularly useful for older cats or those with specific dietary needs.

Are High-calorie Supplements Safe For Cats?

Yes, high-calorie supplements are generally safe for cats when used as directed. They are formulated to be easily digestible and veterinarian-approved. Always consult your vet before starting any new supplement to ensure it meets your cat’s specific needs and health conditions.

How Do Appetite Stimulants Work For Cats?

Appetite stimulants encourage cats to eat more by enhancing flavor and aroma. They can be particularly beneficial for cats experiencing loss of appetite due to illness or stress. These stimulants work by making the food more appealing, thus promoting regular eating habits and weight maintenance.

Can Senior Cats Benefit From Weight Gain Supplements?

Yes, senior cats often benefit from weight gain supplements. These supplements provide extra calories and nutrients to support their aging bodies. They help maintain energy levels, support immune health, and ensure they receive adequate nutrition for overall well-being.

What Flavors Do Weight Gain Supplements For Cats Come In?

Weight gain supplements for cats often come in flavors like chicken, which are appealing to most cats. These flavors help increase palatability and encourage consistent consumption. Some products offer additional flavor options to cater to different preferences among cats.

How Should I Introduce Supplements To My Cat’s Diet?

Introduce supplements gradually to your cat’s diet to avoid digestive issues. Start by mixing a small amount with their regular food. Monitor your cat’s reaction and increase the dosage as recommended. Always follow the product’s guidelines and consult your vet for personalized advice.

Conclusion

Choosing the right weight gain supplement can greatly benefit your cat’s health and happiness. Each product discussed here offers unique benefits. They are designed to support weight gain, boost energy, and improve overall well-being. High-calorie options like under the weather ready cal powder and petag high calorie gel are excellent choices.

They provide essential vitamins and minerals. Bovine colostrum nutritional gel supports appetite and immune health. Solid gold nutrientboost and tiki cat silver comfort mousse also offer valuable nutrients. They are ideal for older or indoor cats needing extra care. It is essential to consult a veterinarian before starting any new supplement.

Your vet can help tailor the best plan for your pet’s needs. Remember, a healthy diet and regular check-ups are vital for your cat’s long-term health. With the right approach, your feline friend can thrive and enjoy life to the fullest.