The 14-Day Arca Glow Protocol

Day 1-3: The Patch Test Phase

The number-one reason brightening soaps "don't work" for sensitive skin is that users skip the patch test.

What to do:

1. Wet a clean inner forearm or jawline with lukewarm water.
2. Lather Arca between palms for 20 seconds. Apply a small amount.
3. Leave on for 60 seconds. Rinse with cool water. Pat dry.
4. Wait 24 hours. Observe.

What you're looking for:

• ✓ No redness lasting >2 hours
• ✓ No itching, burning, or blistering
• ✓ Mild tingling on first use is normal — should fade within 5 minutes

If you see persistent reaction: Stop. Email support@arca-soap.com — full refund.

Day 4-7: First Glow Signal

You'll start using Arca on your face — but only every other day, AM only.

The science behind Day-7 glow:
Niacinamide at 5% works on a 7-day timeline by inhibiting melanosome transfer (Hakozaki et al., Br J Dermatol, 2002). This is what most users experience as a subtle "lit-from-within" effect on the cheekbones and forehead by Day 7.

This is NOT yet the Kojic Acid effect — that takes 4-8 weeks.

What to expect at Day 7:

• Slight overall radiance (not whitening)
• Smoother skin texture
• Possible mild dryness — moisturize after

Take a Day 0 photo and a Day 7 photo. Same lighting, same angle, no filter. Compare side-by-side. Subtle change is real change.

Day 8-14: Daily AM. Tone Evens.

Niacinamide is fully active. Kojic Acid begins to show.

Daily routine:

• AM: 90-second ritual + moisturizer + SPF 30+
• PM: skip (give the skin a recovery cycle)

What 24 of our 30 testers reported at Day 14:

• Visibly more even tone (especially around mouth, jawline, hairline)
• Old acne marks beginning to look subtly lighter
• No major change in deep dark spots — that's Day 28+

If you're not seeing change at Day 14, the most common reasons are:

1. ❌ Skipping SPF (UV reverses progress)
2. ❌ Contact time <30 seconds
3. ❌ Stacking with retinol or AHA same day
4. ❌ Storing the bar wet (Kojic oxidizes)
5. ❌ Bar exposed to direct sunlight (degrades Kojic)

Day 15-28: Going Daily

If your skin tolerates Day 4-14, you can:

• Add PM use (still skip if any irritation)
• Continue daily AM with SPF
• Start observing dark spots — full Kojic Acid cycle is 4-8 weeks

If you experience irritation at any point:

• Reduce frequency to 3x/week
• Add a 2-day rest period
• Reach out: support@arca-soap.com

Day 28+: Dark Spot Fade Phase

This is when the work shows.

Most users report:

• 60% of testers saw visible dark spot lightening at Day 28
• Full Kojic Acid effect manifests at 6-8 weeks (one skin cell turnover cycle)
• Continued use beyond 12 weeks plateaus — maintenance dose recommended

What NOT to layer (compatibility table)

Table same as PDP Compatibility Guide

FAQs about the 14-Day Protocol

Accordion FAQs — see Section 8.4 for verbatim Q&A