Egg protein vs whey compares two animal proteins that reach you in quite different forms. Eggs are usually eaten whole or as cooked whites, and egg white is also dried into a powder. Whey is the protein in the watery part of milk that drains off when paneer or cheese is made. ICMR-NIN's Dietary Guidelines for Indians, 2024, list both eggs and whey among the sources of protein powder.1
Pros and cons of egg protein
Egg white is mostly water and protein. USDA lists raw egg white at 10.9 g of protein in 100 g, with almost no fat.2 Once the water is taken out, dried egg white comes to 81.1 g of protein in 100 g, so a 20 g scoop of the powder gives about 16 g.3
In its position stand on protein, the International Society of Sports Nutrition (ISSN) notes that egg's amino acid profile has been used as the standard for comparing other proteins.4 On protein digestibility, the same stand describes eggs as excellent.4 Egg protein also carries no lactose, since lactose is a sugar found in dairy products and eggs are not dairy.5
The main drawback is who can eat it. Egg protein does not suit anyone who avoids eggs, including vegans and vegetarians who eat dairy but not eggs. Whole eggs also bring the yolk's fat along with the protein. USDA lists raw whole egg at 9.51 g of fat in 100 g, against almost none in the white.6
The yolk adds protein as well. Raw whole egg has 12.56 g of protein in 100 g, a little more than the white alone.6 So choosing whole eggs over whites changes the fat far more than the protein.
Pros and cons of whey protein
Whey's strengths are convenience and speed. The ISSN stand notes that whey dissolves in water, mixes easily and is digested quickly.4 Like egg, it is an animal protein. ICMR-NIN describes eggs and milk as good sources of quality protein, and notes that animal proteins carry all nine essential amino acids.1 That makes both of them complete protein sources.
The drawbacks come from its dairy origin. Whey carries some lactose, the sugar in dairy products, so the sugars figure on a whey label is worth checking if lactose bothers you.5 If you mix whey into milk, the milk adds lactose of its own. Like egg, whey does not fit a vegan diet, but it does suit vegetarians who eat dairy and avoid eggs.
Which one wins
Neither wins on every count, so the useful question is which one suits you. Egg protein suits people who eat eggs and want something with no lactose, whether that is a plate of cooked whites or a scoop of dried egg white. Whey suits people who eat dairy, including vegetarians who avoid eggs, and who want something that mixes easily into a drink.
On quality, both are complete, so the deciding points are what you eat, how you like to take your protein, and what the label says per serving. In this egg vs whey protein choice, the right answer for a vegetarian household can be different from the right answer for someone who eats eggs every morning.
Nothing stops you using both in one day, with an egg-white breakfast and a whey drink later, and each simply adds its protein to the total. If you like to cook, egg whites go into a bhurji or an omelette, while whey is easier to stir into water or milk.
Egg, whey and Horlicks Protein in one day
Horlicks Protein Unflavoured includes whey protein concentrate, paired with fermented yeast protein, and the Chocolate and Coffee flavours are based on fermented yeast protein. Each 36 g sachet gives 24 g of protein once stirred into 200 ml of cold water or milk.
If the egg whites you eat in a day weigh 100 g before cooking, they add 10.9 g of protein, and cooking does not change that amount. With one sachet, the two come to about 35 g, close to two-thirds of the 54 g that ICMR-NIN sets for a 65 kg adult.1
The conclusion is that egg protein and whey protein are both complete, animal-based proteins, and neither wins for everyone. Egg white is about 11% protein raw and about 81% dried, carries no lactose and digests well by the ISSN's account, but it does not suit anyone who avoids eggs. Whey mixes easily and is digested quickly, suits vegetarians who eat dairy, and carries some lactose. Choose by what you eat and how you want to take your protein, and count the grams on the label. Each Horlicks Protein sachet gives 24 g of protein, with whey protein concentrate in the Unflavoured one.
Sources
1. ICMR-National Institute of Nutrition. Dietary Guidelines for Indians, 2024. https://nin.res.in/dietaryguidelines/pdfjs/locale/DGI_2024.pdf
2. USDA FoodData Central. Egg, white, raw, fresh. FDC 172183. https://fdc.nal.usda.gov/food-search/?query=172183&type=SR%20Legacy
3. USDA FoodData Central. Egg, white, dried. FDC 172204. https://fdc.nal.usda.gov/food-search/?query=172204&type=SR%20Legacy
4. Jäger R, et al. International Society of Sports Nutrition position stand: protein and exercise, 2017. PubMed 28642676. https://pmc.ncbi.nlm.nih.gov/articles/PMC5477153/
5. NHS. Lactose intolerance. https://www.nhs.uk/conditions/lactose-intolerance/
6. USDA FoodData Central. Egg, whole, raw, fresh. FDC 171287. https://fdc.nal.usda.gov/food-search/?query=171287&type=SR%20Legacy