9. Krill oil
You can obtain calories from krill oil supplements because they are rich in dietary fats.
This is an excellent supplement to use if you are an ectomorph or want to build muscle.
Krill oil improves metabolism and provides healthy fats and antioxidants.
10. Vitamin A supplements
According to studies, vitamin A protects and promotes cell development in the body’s organs.
Vitamin A is commonly found in animal foods, such as meat, fish, and liver.
Provitamin A or beta-carotene is present in plant sources, such as spinach, carrots, tomatoes, broccoli, winter squash, and cantaloupe. Studies suggest that vitamin A may help you gain weight.