Nicomenthyl compared to other niacin derivates

Articles
Title
Is there a difference between Methyl nicotinate and Menthyl nicotinate? Are they the same thing? Do they have the same properties?
What is the difference between Niacin and Niacinamide?
Is Niacinamide comparable to Nicomenthyl 20 as a skin microcirculation enhancer?
Is Niacinamide as easily absorbed by the skin as Nicomenthyl 20?
Can Nicomenthyl 20 substitute Niacinamide in whitening products?
Can Nicomenthyl 20 be used together with Niacinamide in a cosmetic product?
Why is Nicomenthyl 20 considered the most effective transcutaneous carrier of Vitamin B3 known so far?

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