Sudden weakness after taking multivitamins: what could be the cause?

Hello Subhash ji,

You’re right to question whether just 2 days of taking multivitamins can help. In most cases, multivitamins take 2 to 4 weeks of regular use to show noticeable benefits like improved energy, reduced fatigue, or better skin and hair. Some nutrients, like vitamin B12 or D, may take even longer, especially if the deficiency is severe.

If your wife feels better for a couple of days after taking them, it could be:

• A placebo effect (feeling better just because you expect to), or

• Temporary relief from a mild vitamin deficiency or general tiredness.

But since the weakness keeps coming back, it’s important not to rely only on supplements. This pattern may point to something more, like:

• Low haemoglobin (anaemia)

• Thyroid imbalance

• Poor nutrition

• Or even stress and lack of proper rest

The best step forward is to get a few basic blood tests—CBC, thyroid function, vitamin B12, and D levels—to identify the root cause.

Wishing your wife a speedy and lasting recovery! Let us know how we can support you.