Is the diet plan based on a product called Keto Ignite and apple cider vinegar, an effective and safe weight loss adjunct?

It is both safe and effective. Is it the best, you are wondering? This is still somewhat subjective because all such methods will depend on the degree of adherence, how strictly and for how long a period of time, and how much bending of the rules might be done. These variables will affect one plan more so than another, so we can say this is a reasonable starting point and will achieve results if it is adhered to.