YES, I'm a big believer in Jello. When I was little my mom used to make "sippy jello" which was prepared Jello, but you would drink it warm and it would fill you up.
One thing that'll help cold symptoms is gelatin. It's a good way to get in fluids and it soothes your throat. You can get store bought Jello brand and put a tablespoon in a cup of hot water and drink it like tea a few times a day. Be careful to only get the fruit kind that contains gelatin though. One day when I was sick, I was on my way to work and had to stop at a convenience store for Jello and could only find vanilla (I work a mask that day so I didn't give my cold to my patient who probably gave it to me to start with.) Vanilla only has cornstarch in it. The fruit flavors have gelatin. It really helps a sore throat. Honey also helps a cough, I mean immediately. Honey also helps sleep too, I drink plain gelatin with raw honey and hot water (plus coconut oil) and a splash of milkadamia milk as a bedtime drink.
In recent years I've added the sugar free to my diet as well as the non flavored mixed with orange juice or fresh blended berries, etc. I noticed my hair has gotten stronger and my joints don't ache as much as they did before.
Now the eyebrows. I had gorgeous brows back in the 80's, I'm not sure why but in the early 90's I started plucking thinner brows, well here we are 27 years later and I haven't plucked my brows in 6 years and they're just starting to grow back.
As for the chin hair, I have 3 tree trunks that seem to grow back daily, but on the upside, I no longer have to shave my legs or arm pits.