The best thing you can do for your gums is keep them clean. Brush twice a day with soft bristled brush engaging the bristles at the gum margins agitate and sweep . Use circular light handed strokes instead of left to right motion . Use a gum paint to massage your gums. And do week mouthwash rinsing course every other month. Visit a dentist for a scaling every 6 months to a year. No supplements can replace physical cleaning.

U just need to massage your gums regularly for better blood circulation and do warm saline rinses , for healthy gums No need to take any vitamin supplements ... You can just increase the intake of vitamin c in your diet ...