Nutrition is not about finding one “complete” food. People need a varied combination of macronutrients, vitamins, minerals, fibre and enough energy, with requirements changing across age, activity, pregnancy and health conditions.
Spirulina can contribute protein, iron and other nutrients, but it does not replace vegetables, fruit, legumes, grains, nuts, seeds or other suitable foods.
If you have a diagnosed deficiency or a restricted diet, seek individual advice rather than relying on one product.