From the Super Mario Wiki
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They come in six different color combinations of red, blue, or yellow (Red+red, blue+blue, yellow+yellow, red+blue, yellow+blue, red+yellow, or in the Game Boy version Black+black, grey+grey, white+white, black+grey, black+white, and white+grey). Dr. Mario uses the Megavitamins to destroy viruses, in the game Dr. Mario. In Japanese, Megavitamins are simply called カプセル(Kapuseru); Capsules.
In Super Smash Bros. Melee, Super Smash Bros. for Nintendo 3DS / Wii U, and Super Smash Bros. Ultimate, Dr. Mario's standard special is Megavitamins, in which Dr. Mario tosses a Megavitamin at opponents. They act the same as Mario's Fireball move, except that the Megavitamins are more powerful. They also bounce in a different path, and make a different noise when it hits. There's also a trophy of Dr. Mario shooting Megavitamins and one of the vitamins themselves. Kirby is also able to use the Megavitamins if he copies Dr. Mario, although the sound that plays when the Megavitamin hits an opponent is different. Like in the Dr. Mario games, the Megavitamins are randomly generated with different color combinations, though this has no effect on the attack itself. Super Smash Bros. for Nintendo 3DS / Wii U also gives this move two customizable variants, which are similar in effect to Mario's Fireball customs. The first is Fast Capsule, which sends out a fast-moving but weaker Megavitamin that travels directly forward, and the second is Mega Capsule, which sends out a slow-moving giant Megavitamin that does not travel as far but deals multiple hits of damage.
In WarioWare, Inc.: Mega Microgame$!, a minigame called Dr. Wario features Wario in a doctor persona using megavitamins to eliminate viruses. In addition, starting with the game Dr. Luigi, Luigi's doctor persona also uses megavitamins to eliminate viruses. Also starting with Dr. Luigi, L-shaped megavitamins have been used.