Why do some cyclists swear by B-vitamin supplements for energy production, while others claim they have no effect? Is it true that B-vitamins can only help with energy production if there is an underlying deficiency, or can they actually enhance performance in healthy individuals as well? Whats the optimal dosage and timing for B-vitamin supplements to have a noticeable impact on energy levels during long rides? Should cyclists focus on individual B-vitamins, such as B6 or B12, or is a broad-spectrum B-complex supplement sufficient? Can anyone explain why some studies suggest that B-vitamin supplements have a greater impact on energy production during high-intensity, short-duration efforts versus low-intensity, long-duration rides? Should cyclists be concerned about potential interactions between B-vitamin supplements and other performance-enhancing compounds, such as caffeine or beta-alanine? Do B-vitamin supplements offer any benefits for riders who primarily focus on endurance events, or are they more geared towards sprinters and high-intensity athletes?