FRIDAY, April 25 (HealthDay News) -- You can grow a healthier tomato by watering it with diluted seawater, a new study shows.

Remember when vitamin C was hailed as the best, and maybe only, cold remedy? Then it became the Rodney Dangerfield of vitamins: It didn't get any respect.

The nutrient's glory days of curing scurvy-riddled sailors via juicy citrus fruit seemed to be the only thing keeping its reputation afloat, particularly after a massive research review found C to be virtually useless for fighting colds. But don't believe it.

(HealthDay News) - Vitamin C is an antioxidant that's found primarily in citrus fruits, leafy green vegetables, broccoli, potatoes and other fruits and veggies.

Significant enough vitamin C deficiency can lead to a condition called scurvy.

Here are warning signs that you're not getting enough vitamin C, courtesy of the U.S. National Library of Medicine:

* Excessively dry hair with ends that split easily.
* Scaly, rough, dry skin.
* Bleeding or inflamed gums.
* Wounds that heal slowly, frequent infections, and bruising easily.
* Frequent nosebleeds.