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Figure 7A)

In a randomized, placebo-controlled study of 495 patients with intermittent claudication, 2 g/day of propionyl-L-carnitine for 12 months significantly increased maximal walking distance and the distance walked prior to the onset of claudication in patients whose initial maximal walking distance was less than 250 meters (m), but no effect was seen in patients who had an initial maximal walking distance greater than 250 m (65)

And while B vitamins support overall immune function, there's no evidence they prevent colds if you're getting adequate amounts from food

These also have FDA clearance

transient headache, nausea, fatigue