Standard supplement recommendations are derived largely from research on Western populations with different dietary patterns, different sun exposure profiles, and different baseline micronutrient levels. When that research gets turned into product formulations, those assumptions come with it.
Three deficiencies show up reliably in urban Indian populations at rates significantly higher than global averages. Vitamin D deficiency affects an estimated 70–100% of urban Indians across age groups — not because India lacks sun, but because office hours, pollution-filtered UVB, and high-SPF use mean that sun exposure doesn't translate to synthesis the way it's assumed to. B12 deficiency is structurally elevated in any population with a large vegetarian proportion. Magnesium depletion accelerates under chronic stress and is frequently missed because serum magnesium is a poor proxy for cellular magnesium.
Starting from these facts changes the baseline. And the baseline changes the protocol.
Ritu & Gupta, Indian Journal of Community Medicine, 2014 — Vitamin D status across 25,787 Indian subjects. Deficiency prevalence: 70–100% across age groups.