What vitamin deficiency causes receding gums?

Not any: I don't think there is a specific vitamin deficiency that would affect just the gums and cause them to recede. If you are so malnourished that the gums are receding, i think you have bigger problems to worry about. Remember, then only way the gums can recede, is if the jawbone underneath goes first.

Vit c: In particular is a building block for collagen, a main ingredient for tissue repair.

Vitamin B12,C AND D: Vitamin cdeficiency is known to cause scurvy which can cause gum disese vitb12 deficiency is also known to cause periodontal disease and vitamin d deficiency is also commonly responsible for gum disease.